Correct answer is A hope this helps
Answer:
They are also keystone species, playing an important role in maintaining the biodiversity of the ecosystems in which they live. During the dry season, elephants use their tusks to dig for water. ... Wherever they live, elephants leave dung that is full of seeds from the many plants they eat.
Explanation:
There are 20 different types of amino acids found in proteins.
1. Variable
2. Pea plants reproduce sexually.
Female and Male sex cells on pea plants (have a variety of traits) allowed Mendel to cross pollinate them.