Answer:
LD50 means a lethal dose of a particular substance or drug is given to a group of animals in a test group. This dose has the ability and capacity to kills 50% of the population of the test group of animals.
If Substance A has an LD50 of 20 mg/kg of body mass, this means that for 1 kg of body mass, 20 mg of substance A can kill 50% of the population that substance A was given to the test group.
If Substance B has an LD50 of 10 mg/kg of body mass, this means that for 1 kg of body mass, 10 mg of substance A can kill 50% of the population that substance B was given to the test group.
Therefore, Substance B is deadlier than Substance A because the quantity of substance B (10mg) is less than the quantity of Substance A (20mg) and it has the same lethal effect on the population.
Explanation:
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Answer:
B
Explanation:
Substance B is deadlier than Substance A because the quantity of substance B (10mg) is less than the quantity of Substance A (20mg) and it has the same lethal effect on the population.
fleas are insects but they do not have wings. suggest two features of fleas that would show that they should be classified as insects.
Answer:
Antennae and 6 legs
Explanation:
What is responsible for the apparent motion of the Moon in the sky from East to West? A) The rotation of Earth about its axis B) The revolution of Earth around the Sun C) The rotation of the Moon about its axis D) The revolution of the Moon around Earth
Answer:
The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis
Explanation:
The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next
please mark as brainliest pleaseWhat would happen if the salmon were over harvested
What morphologic character determines the jumping ability of anole lizards?.
The morphological character that determine the jumping ability of anole lizard is that the toe pads is larger, with more sticky scales on their feet.
What is morphological character?Morphological character refer to the features or characteristics posses by organisms or their species which define the organisms form.or structures.
Therefore, The morphological character that determine the jumping ability of anole lizard is that the toe pads is larger, with more sticky scales on their feet
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Mary loved having her goldfish tank in her office. She said watching the fish swim around was calming to her on stressful days. Mary thought that if 2 goldfish in her tank could make her less stressed then certainly 8 goldfish would be even better. After three days of having 8 goldfish in her tank, she noticed 5 of the fish began to sink to the bottom of the tank becoming less active than the remaining 3. A few days later the 5 sick fish died and the 3 remaining fish thrived. Use the data to help you choose three reasons the carrying capacity of the fish tank wasn’t able to accommodate all 8 goldfish.
A.
There was a limited supply of food available to sustain all 8 fish.
B.
There was an unlimited amount of space for the fish to swim.
C.
The amount of dissolved oxygen in the tank was not replenished quickly enough to sustain all 8 fish.
D.
The ammonia levels in the tank did not compromise the life of the fish.
Answer:
A
C
D
Explanation: Because since C is not right, we can immediately assume that the rest are the answers. It says that 3/4 are right, so it would be ACD, also they make sense.
Organism that can be found in your locality
Answer:
earthworm
Explanation:
Simply earthworm are found in under the grass
earthworm helps in making soil fertilize
Which of Mendel’s laws or principles state that gametes carry one allele for each trait?
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A sample of iron has dimensions of 2 cm x 4 cm x 6 cm and a mass of 100g. What is the density of the sample?
What happens to the rate of diffusion if the temperature is raised?
Answer:
The rate of diffusion increases
Explanation:
This is because increase in temperature causes increase in the average speed of molecules which increases the rate of diffusion
Answer:
The higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly. The greater the surface area, the faster the rate of diffusion.
List 2 objects that look like tightly coiled strands of DNA?
Chromosomes and linkage groups are 2 fragments of DNA ordered in decreasing size that represent tightly coiled strands of DNA.
What is DNA?Deoxyribonucleic acid (DNA) is the genetic material that all organism uses to transmit hereditary characteristics.
DNA is a double helix molecule composed of two long chains of nucleotides linked via hydrogen bonds.
In eukaryotic cells, DNA is associated with histone proteins, which make it a tightly coiled molecule.
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Which type of fossil do scientists use to compare the relative ages of other fossils?.
Answer:
Index Fossils
Explanation:
Index fossils are used by scientists to help them figure out the dating of discovered fossils or the correlation. They are also very known to appear in a (very) certain/specific age range.
Hope this Helps!
3
Use the information and your knowledge of science to answer the question.
As trees grow over time, the trees form new cells in circles called annual growth rings. These rings show the amount of
wood produced during one growing season or year, as well as the effects of different environmental conditions on the
tree. The figure shows the growth rings for two different types of trees growing in the same forest area
Due to differences in age and growth rate of the trees, the growth rings for two different types of trees growing in the same forest area may vary.
What are annual growth rings?Annual growth rings are rings of cells which form as trees grow over time and these rings represent the amount of wood produced during on growing season.
Annual growth rings provides estimates of the age of trees.
Distinct annual growth rings are formed in trees growing in temperate regions where there are sharp climatic variations.
The diameter and thickness of growth rings of different trees vary since trees grow and different rates.
Therefore, the growth rings for two different types of trees growing in the same forest area may vary due to differences in age and growth rate of the trees.
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What percentage of water on Earth is Freshwater?
O 23%
O 13%
O 3%
0 35%
Answer:
A tad-size 3%
Most of the earth's water is actually salt water. Suppose we could not drink this type of water, but some sea creatures and plants need it. 3% of the earth's water is fresh water, and that small 3% actually is in water bottles, too!__________________________________________________________
Questions?Ask in the comments.
What is the major evidence for the punctuated equilibrium model of evolution?.
Why does the land on earth appear to be stable when in fact it is changing?
What is a biotic factor?
A. anything that can change in an ecosystem
B. the living influences of an ecosystem
C. a component of an ecosystem that cycles through it
D. anything that affects the living organisms
Answer:
the living influences of an eco system
Answer:
B
Explanation:
A biotic factor is any living thing that affects the ecosystem around it. Biotic is referring to life/something alive and a factor is something that influences another thing.
Hemoglobin is crucial for oxygen transport in the blood because oxygen has a _______ solubility coefficient in water.
Answer: Hemoglobin is crucial for oxygen transport in the blood because oxygen has a low solubility coefficient in water. :)
All cells have _____. (Select all that apply.)
a nucleus
an outer membrane or plasma membrane
large vacuoles
cytoplasm
a cell wall
chloroplasts
protoplasm
All cells have:
plasma membraneHope that helps!
* our skin can be compared to what cellular organelle? explain.
a short note on plant cells and animal cells
Answer:
Nucleus, cell membrane, cytoplasm and mitochondria are four cell components that are found in both animal and plant cells.Explanation:
Please help me I don’t ‘now how to write essays very well high school level I desperately need help on this one assignment
Answer:
put it in trash bin .......
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Spiny or sticky pollen grains and large, attractively coloured flowers are associated with
(a) hydrophily
(b) entomophily
(c) ornithophily
(d) anemophily
Answer: insect pollination
Explanation: The insect come to the flower which are brightly coloured to collect nectar from it.
Answer:
Entomophily
Explanation:
Entomophily denotes to pollination thorough agencies of several insectsThis kinds pollination is also called insect pollinationFlowers make them attracting to attract those insectsOption B
Brown coat color rabbits possess the dominant allele B, and white coat color rabbits possess the recessive allele b. If the frequency of the allele for white coat color is 0.04, what is the frequency of the dominant allele in the population?
Assuming Hardy-Weinberg equilbrium, we have
p + q = 1
where p = frequency of dominant allele and q = frequency of recessive allele. So
p = 1 - q = 1 - 0.04 = 0.96
Consequently we have
• p² = 0.9216 = frequency of hom ozygous domininant genotype
• pq = 0.0768 = frequency of heterozygous genotype
• q² = 0.0016 = frequency of hom ozygous recessive genotype
since
p² + 2pq + q² = 1
which of the following occurs during a lysogenic cycle?
Desensitization to prevent an allergic response can be accomplished by injecting repeated doses of: Group of answer choices IgE antibodies the antigen (allergen) histamine IgG antibodies antihistamine
Desensitization to prevent an allergic response can be achieved with doses of the antigen.
How do these doses of Antigen cause desensitization?The small and controlled doses of antigen (allergen) can cause desensitization to said allergy. This is because they allow the body to slowly build up natural defenses to this antigen, allowing it to be better prepared to combat said antigen during the next exposure.
Therefore, we can confirm that desensitization to prevent an allergic response can be achieved with doses of the antigen.
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Which of the following is most likely to cause a change in the genetic traits in an isolated population of a ground-dwelling lizard species?
The exposure of an individual lizard in the population to radiation that causes a mutation that is not passed on to its offspring.
An unusually dry summer in the lizard population's ecosystem.
The introduction of an invasive predator that preys on the brightest-colored individuals in the lizard population.
A fast-moving wildfire that burns the canopy of the trees in the lizard population's ecosystem.
The answer would be: C - The introduction of an invasive predator that preys on the brightest-colored individuals in the lizard population.
The arrival of an invading predator that targets the lizard population's individuals with the most vibrant colors. Thus, option C is correct.
What is an invasive predator?
Invasive species pose one of the largest problems for natural creatures. About 42% of species that are vulnerable to extinction or endangered are threatened by invasive species.
Invasive species may pose harm to the economy and human health. Each year, invading species has severe negative effects on our economic and natural ecosystems.
An invasive species is any living creature that is not naturally present in an ecosystem and endangers it, including plants, mammals (like the cane toad), insects, fish, fungi, and germs.
Therefore, The introduction of an invasive predator that preys on the brightest-colored individuals in the lizard population.
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Please help me
Two brown eyed parent have two childron with blue eyes. Give the genotypes of
each family member.
Albinism (lack of pigment) in humans is caused by a recessive gene. If normal
parents have an albino child, what is the probability that their next child will be
normal for pigment color?
Image result for Two brown eyed parent have two children with blue eyes. Give the genotypes of each family member.
The only way to present blue eyes is to inherit two copies of the blue-eyed gene. However, brown-eyed parents can pass a recessive blue-eyed gene. Therefore, two brown-eyed partners can birth a blue-eyed baby.
O A. Spindles
O B. Chromatids
O C. Centromeres
O D. Gametes
Answer:
D. Gamates
Explanation:
Meiosis is a cell division that ends up producing gamates as sperm or egg cells.
Come up with a hypothesis as to why the Siamese cat has darker fur on certain parts of its body.
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which abolitionist or slave was the most productive and helping to end slavery? Explain your answer
Answer:
William Lloyd Garrison
Explanation:
During the 1830s, a new type of radical abolitionist appeared. These abolitionists called for the immediate end to slavery. One of the most prominent radical abolitionists was a man named William Lloyd Garrison. Garrison called for slavery's immediate end as well as equal rights for African Americans with whites.