Can anybody give me a pdf or note about the flatworms?
Flatworms
James H. Thorp, D. Christopher Rogers, in Field Guide to Freshwater Invertebrates of North America, 2011
B Reproduction and Life History
Some flatworms, especially those living in temporary aquatic habitats, reproduce only once per year (univoltine), while other species are multivoltine, with the number of generations depending on environmental favorability. Most flatworms reproduce sexually, and almost all species are hermaphroditic. Although gamete exchange is most common, self-fertilization is possible in some species. Eggs are laid singly on a hard substrate, are grouped into clusters (sometimes stalked), or are placed in cocoons. Miniature flatworms emerge from eggs which have been attached to the substrate. These usually develop directly (without intermediate larval stages) into adults and differ only in size and presence of reproductive organs. A few species are ovoviviparous (young brooded inside parent) or have a distinct larval stage. Asexual reproduction occurs seasonally in many taxa and is the only form of reproduction in a few species. This form of reproduction involves differentiation of the adult body into distinct units (zooids) followed by separation into small flatworms via transverse division of the adult body. This process is aided by the remarkable regenerative abilities of flatworms.
Under demanding environmental conditions, flatworms produce resistant eggs able to survive desiccation of the surrounding environment or the animal may enter diapause (a very low metabolic state) and encyst as a whole animal or fragment of the adult.
Sexually reproducing flatworms can live from a few weeks to a few months (not counting periods of encystment), while the life span of asexual species is theoretically indefinite.
SOLVE A wildlife biologist and her team counted 200 individual deer
in an area of 10 square kilometers. What is the population density?
A. 20 deer per square kilometer
B. 10 deer per square kilometer
C. 2 deer per square kilometer
D. 200 deer per square kilometer
Answer:
Explanation:
Members of the same species living together
Which is NOT a protective
covering for the moneran?
A cytoplasm
B. cell wall
C. capsule
D. cell membrane
Answer
Explanation:
C.capsule
14. The Endosymbiotic Theory explains
*
O A. The origin of eukaryotes
O B. How species develop
O C. How bacteria live
O D. Why cells rely on one another
Answer:
A) the origin of eukaryotes
Explanation:
The Endosymbiotic theory talks about how the ancestors of modern eukaryotic cells were once 2+ prokaryotic cells. This theory says that one prokaryotic cell basically lived inside another prokaryotic cell and these cells formed a long term relationship. The prokaryotic cell eventually became a permanent part of the host and eventually evolved into modern day eukaryotic cells.
The Endosymbiotic Theory explains the origin of eukaryotes.
What is endosymbiotic theory?The endosymbiotic theory posits that some eukaryotic cell organelles, such as mitochondria and plastids, evolved from free-living prokaryotes.
The most significant examples of endosymbiosis are represented by the endosymbiotic acquisition of plastids and mitochondria, introducing photosynthesis and respiration to eukaryotes.
Eukaryotic cells may have evolved when multiple cells joined together into one. They began to live in what we call symbiotic relationships. The theory that explains how this could have happened is called endosymbiotic theory.
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Which of the following is a derived unit? *
1 point
Mass
Volume
Density
Length
Which of the following is not found in an observational study? A-controlled variable B-manipulated variable C-None of these are found in an observational study. D-control group
Answer:
C-None of these are found in an observational study
Explanation:
(A.) controlled variables are a part of what's found in a controlled experiment. (B.) manipulated variables are a part of what's found in a controlled experiment. (C.) Answer choice A. or Controlled variables, Answer choice B. or Manipulated variables, and Answer choice D. or Control groups are a part of what's found in a controlled experiment. (D.) Control groups are a part of what's found in a controlled experiment. Therefor this only leaves one answer and that answer is Like I said C-None of these are found in an observational study.
when a solute is added to water does the water potential increase or decrease
Answer:
It will decrease.
Explanation:
The amount of available potential energy is reduced when solutes are added to an aqueous system
gets rid of cell waste by breaking down large molecules into smaller ones for the cell to excrete. The helps these waste molecules exit the cell.
Answer:
Lysosomes I believe are the parts of a cell that gets rid of waste.
The variable that is the same between the control group and the experimental group is? 1. The control variable. 2. The dependent variable. 3. The measured variable. 4. The independent variable.
Answer:
1. The control variable
What do meteorites suggest about Earth's composition?
Fill in blanks! Thank you!
Answer:
1.Horizontal
2. Valence electrons
3. Family
4. Properties
Explanation:
What is the difference between organic and in organic compounds? Give an example of each type of compound.
inorganic compounds:
-usually lack carbon
-are not associated with or made from living things
organic compounds:
-contain carbon and other elements
-are found in organisms
i just learned this!! i hope it helps.
:)
Explanation:
The main difference between the two classes of substances is that organic compounds always contain the element carbon, while most inorganic compounds lack this element.
example of organic compound is methane, CH4
example of inorganic compound is, argon Ar
How are amino side chains usually classified? a. Small, Medium, or Large b. Straight, branches, or ringed c. Charged, polar, or non-polar d. Reactive or non-reactive
Answer:
C. Charged, polar, or non-polar
Explanation:
Amino side chains, also called R groups, are classified into the categories of charged, polar, and non polar.
These classifications can be determined by the structure and elements within the R group/functional group.
Describe the structure of atoms,including the masses, electrical charges, and locations of protons, neutrons and electrons.
Everything on earth is made up of a fundamental particles that is impossible to see with the naked eye this particle is called the atom. There a over a 100 atoms or more in science. At the center of the atom is the nucleus which contains protons and neutrons. Electrons can be found moving around the orbitals or energy levels , while most of the area outside the nucleus is empty space .
Most of the mass of an atom is concentrated at the center of the nucleus.
Atoms are made up of three subatomic particles called
1. Protons
2. Neurons
3. Electrons
protons - has positively charge particles with a charge
of +1
Neutrons- has no charge it is neutral, 0 charge.
Electrons- has a negative charge particles with an charge of -1.
Relative mass of a particle is the mass compared to the mass of a proton
Relative charge of a particle is the charge compared to the charge on a proton.
Atom is a basic unit of matter have proton and neutron containing nucleus at the center and surrounding electrons.
What do you mean by atom ?
Atoms are the smallest and basic units of matter.
A negatively charged electron which surround the nucleus of the atom moving around the orbitals or energy levels.
The nucleus does not change during chemical reactions, only in nuclear reactions it will change.
In nucleus equal number of protons and neutrons, atomic number is the number of protons and atomic mass is made of the sum of protons and neutrons.
Relative mass of a matter is the mass of a proton while Relative charge of a matter is the charge on a proton.
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HELP!
Which step was most likely performed by the researcher during the
purification process?
O A. The protein was separated from lipids.
OB. The protein was stabilized using lipids.
C. The protein was separated from nucleic acids.
D. The protein was separated from nucleic acids.
Answer:
A
Explanation:
How do producers use the sun to get their energy?
Answer:
the answer is photosynthesis
Explanation:
Answer: Producers make their own food by photosynthesis, which is a process where plants get their energy from the sun and can make their food using the sun and rain. I hope this helps in some way!
can anybody help me with this?
Answer:
presence of sugar means that the outside of the fruits is less dilute (more concentrated in sugar than water) than the inside of the fruits
in osmosis (diffusion of water molecules), water molecules have a net movement from a more dilute substance to a less dilute substance
sugar is the less dilute substance, so water is drawn out of the fruits and mixes with the sugar around them
the sugar dissolves in water, creating a sugar solution
this results in fruits with less water inside them, and surrounded by sugar solution
Hope this helps :)))
Answer:
the grass hopper lives on land the fish lives in water.
both can see
Explanation:
Scientific Process , Describe its importance
Answer:
The scientific method attempts to minimize the influence of bias or prejudice in the experimenter. Even the best-intentioned scientists can't escape bias. It results from personal beliefs, as well as cultural beliefs, which means any human filters information based on his or her own experience. Unfortunately, this filtering process can cause a scientist to prefer one outcome over another. For someone trying to solve a problem around the house, succumbing to these kinds of biases is not such a big deal. But in the scientific community, where results have to be reviewed and duplicated, bias must be avoided at all costs.
That's the job of the scientific method. It provides an objective, standardized approach to conducting experiments and, in doing so, improves their results. By using a standardized approach in their investigations, scientists can feel confident that they will stick to the facts and limit the influence of personal, preconceived notions. Even with such a rigorous methodology in place, some scientists still make mistakes. For example, they can mistake a hypothesis for an explanation of a phenomenon without performing experiments. Or they can fail to accurately account for errors, such as measurement errors. Or they can ignore data that does not support the hypothesis.
Hope I helped ya
When many _______ are connected by ________ we call it a polysaccharide.
When many monosaccharides are connected by glycosidic bonds we call it a polysaccharide.
When a cell changes to become a [BLANK] cell, it is called differentiation
Answer:
It is a specialized cell
Explanation:
The cell changes from a simple zygote to a complex system of tissues and cell types.
science deals only with phenomena that can be _________. ??????
Answer:
OBSERVED!
Hope this helps :)
Answer: Observed
Explanation:
Science can only answer in terms of natural phenomena and natural processes. ... Though atoms cannot be seen with the naked eye, they can be studied with the tools of science since they are part of the natural world. Rutherford's story continues as we examine each item on the Science Checklist.
Which of the following is NOT part of the cell theory? *
All living things are made up of one or more cells.
Cells come from other cells.
The cell is the basic unit of life.
Cells are made of organelles.
Answer:
Cells are made of organelles.
Answer:
cells are made of organelles
Explanation:
because it is why the cells has different kinds
Plsss helppp 40 extra points and brainleist
Answer:
The virus lacks strcutures to replicate genetic material.
Explanation:
They can replicate it, but don't have structures to do it without the help of a cell. They USE the cell to replicate it but cannot do it themself.
Virus lacks genetic matrial? It has DNA.
Protective outer shell? Ptotection has nothing to do with it.
Movement? They cannot duplicate without cells.
Early Romans discovered that objects could be magnified through the construction and shaping of glass. For the past thousand years, this discovery has led to the construction and design of modern day microscopes. The development
Every object in the universe is made of cells.
Cells are made from atoms during chemical reactions.
⊝
All cells are identical.
⊝
All living things are made of cells
Please help meeeeee
Answer:
Try "all living things are made of cells". I'm really just guessing,but good luck!!!!!!
Which of the following instruments produces highly magnified images of a cell’s internal structure but cannot be used to examine living cells?
Answer:
Transmission electron Microscope
Explanation:
It produces thin slices of photography and extremely tiny things. The disadvantages are that its expensive, and you cannot test living things with it, its also massive
The rock cycle is not important to living organisms.
Please select the best answer from the choices provided
OT
OF
Answer: of
Explanation:
it is of
Write function of animal tissue. Don't answer if you don't know
Answer:
Animals tissues are grouped into four basic types: connective, muscle, nervous, and epithelial. ... It serves functions of protection, secretion, and absorption, and is separated from other tissues below by a basal lamina.
Answer:
In animals there are four types of tissues. Their functions are::
1. Epithelial tissue: covers body surfaces ,line the body cavities ducts and glands.
2. Connective tissue: support the body and binds body organ together and stores the fat.
3. Muscular tissue: contraction and movement
4. Nervous tissue: transmit nerve impulse that coordinate body activities.
how can liquid be drawn into a pipette safely
Answer:
A. by squeezing and releasing a bulb attached to the wide end of the pipette
Explanation:
A. by squeezing and releasing a bulb attached to the wide end of the pipette
How many muscle tells are in the heart?
Answer:
2 billion
Explanation:
i hope this helped