What is the function of the structure labeled Y?

A. to keep oxygen-rich blood and oxygen-poor blood flowing

B. to filter waste materials from oxygen-poor blood

C. to filter waste materials from oxygen-rich blood

D. to keep oxygen-rich blood and oxygen-poor blood
separate

could u send a pic of what the structure looks like

D

Explanation: im on edgunewity i know what your talking about

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"