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Illusion [34]
3 years ago
9

Why does dna contain thymine but rna contains uracil?

Biology
1 answer:
uysha [10]3 years ago
6 0
<span>Thymine is harder to make, but more stable. DNA needs to keep information safe for a long time, so it makes sense to use thymine. But RNA is made and used quickly, and small mistakes don’t matter as much, so the easier to make uracil does the job.</span>
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With the severe changes to natural environments, many species are coming into contact with other species from which they were on
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Answer:

Postzygotic isolating mechanism

Explanation:

Reproductive isolation can occur due to prezygotic or postzygotic isolating mechanism. Prezygotic mechanism prevents fertilization of gametes and can occur due to different mating behavior, different mating time period etc. Postzygotic mechanism occurs after the formation of zygote i.e. the organisms are able to mate and fertilization also occurs. However the resultant zygote may not survive. It might not survive immediately or might die before reaching the reproductive maturity. Such a situation would still come under reproductive isolation because the resultant offspring is not viable and not able to pass on the genes to the next generation.

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3 years ago
What does competition mean and how might you see competition in an ecosystem?
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Answer:

Ecological competition occurs when living organisms, including animals, plants, bacteria and fungi, need the same limited resources to thrive in their shared environment. An ecosystem could collapse if several species needed the same scarce resources to complete their life cycle. Competition will occur between organisms in an ecosystem when their niches overlap, they both try to use the same resource and the resource is in short supply. Animals compete for food, water and space to live. Plants compete for light, water, minerals and root space.

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3 years ago
In chickens, a condition referred to as "creeper" exists whereby the bird has very short legs and wings, and appears to be creep
Aleks04 [339]

Answer Explanation:

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3 years ago
What is An estuary according to biomes
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Another problem Darwin had was the lack of technology. To travel, Darwin would have to use boats to reach far away places, and of course, this took time.
The final problem Darwin had was the extra time it took for evolution, a process that can take up to millions of years. Evolution didn’t occur over night— it took time for Darwin to conduct experiments, observe, conduct them again, come to a conclusion, and so on.
Hope this helped a little!
6 0
2 years ago
Read 2 more answers
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