Answer:
they croak to show agresion
Explanation:
b/c they use it to pretect females
Answer:
A chromosome is made of a very long strand of DNA and contains many genes (hundreds to thousands). ... The genes on each chromosome are arranged in a particular sequence, and each gene has a particular location on the chromosome (called its locus).
Explanation:
Secondary since plants/animals already lived there, but got killed/driven out of the area they lived/thrived in/on.