It weakens the immune system making it unable to defend itself against viruses and it also attacks the immune system..
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Answer:
Mutations can create entirely new alleles in a population which changes the allele frequencies of a gene pool.
Answer:
Because each duplicated chromosome consists of two identical sister chromatids joined at a point called the centromere, these structures now appear as X-shaped bodies when viewed under a microscope. Several DNA binding proteins catalyze the condensation process, including cohesin and condensin.
Explanation:
I think the correct answer from the choices listed above is the third option. The barrel of a gun is also known as bore. The barrel is the metal tube which the bullet is fired and the bore is the inside of the barrel. It is the one closest to the barrel so it must be the answer.
It starts with a seed, than when the seed is on the ground it germinates.