<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:
Oxygen
Explanation:
It's air. why would it carry water
Receptor proteins, they then send out the signal to perform a task or duty