Genetic variation<span> is essential for </span>natural selection<span> because </span>natural selection can only increase or decrease frequency of alleles that already exist in the population.Genetic variation<span> is caused by: mutation
i pulled this off of the site i got the information from i hope this helps you out if not sorry
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The role of xylem is to transport water and some nutrients from roots to shoots and leaves.
Answer: phylum
Explanation:
kingdom, phylum, class, order, domain, family, genus and species
The change of temperature lava cools down/seconds it flows down.
