Answer:
It is A
Explanation:
It is the only one that makes sense
Hope this helps
In meiosis? Tetrads maby? When two homologus chromosomes do crossing over they're called tetrads so..
It helps get rid of carbon dioxide.
Took me a while to understand any of this XD
Subduction i think,when they are pushed together one subducts forming a trench.im probably not right,sorry