Climate , topography , soil , disturbance
B, as far as we know humans aren't from space
Glycoprotein Cell Receptors, but you can probably just put proteins
<em>crossing-over affect evolution...
<u>reason:
</u>during crossing-over chromosomes exchange their genetic information...
because of this variations occur in new generation,, in new generation some characters are from maternal chromosomes and some are from paternal chromosomes... </em>
Answer:
it is the change in one or more genes
