Answer:
b
Explanation:
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The Inner layer of tissue is used for digestion.
Environmental factors do influence natural selection because they can increase or decrease the population of a species, by selecting those with only favorable traits.
Answer:
A
Explanation:
The DNA is made 4 nitrogenous bases. A (adenine) pairs with T (thymine) and are held by two hydrogen bonds. C (cytosine) pairs with G (guanine) and are held by three hydrogen bonds.
You might wanna remember this by the preposition 'at', which ultimately makes C and G together. Or you might wanna remember it by something like G- C<em>AT</em>.