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defon
2 years ago
7

In the past, smallpox, which is caused by a virus, was a common, and deadly disease. Now, people no longer get smallpox.

Biology
1 answer:
LenKa [72]2 years ago
3 0

Answer:

Answer is a

Creating memory cells through vaccination

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<span>A mature sporophyte produces spores by meiosis, a process which reduces the number of chromosomes to half, from 2n to n. Because meiosis is a key step in the alternation of generations, it is likely that meiosis has a fundamental adaptive function. The nature of this function is still unresolved (see Meiosis), but the two main ideas are that meiosis is adaptive because it facilitates repair of DNA damages and/or that it generates genetic variation. The haploid spores germinate and grow into a haploid gametophyte. At maturity, the gametophyte produces gametes by mitosis, which does not alter the number of chromosomes. Two gametes (originating from different organisms of the same species or from the same organism) fuse to produce a zygote, which develops into a diploid sporophyte.</span>
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3 years ago
1.2.4 Quiz: Principles of Heredity
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A form of a gene

Explanation:

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What challenges do hydrostatic pressure creates for marine scientists
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All living organisms contain carbon atoms. Which of the following is an important characteristic of carbon?
SashulF [63]
A characteristic of carbon is that it is highly reactive and can form unstable bonds with any available atom. 
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Why do Earth, Mars, and Venus lack any hydrogen and helium in their atmospheres?
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Some of the hydrogen bonds with other elements, but most of it remains free hydrogen. Both hydrogen and helium are light elements, so they will tend to evaporate into space over time. ... But the gravity of Earth isn't strong enough, so Earth's early atmosphere of helium and free hydrogen evaporated into space.

Explanation:

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