Vertebrates have back bones or spines that give there body support.
Answer - A. Deep because there is less O2 exchange
Reasoning - Bacteria has been known to only use half a percentage which is .5 percent of O2.
Answer:
B is most probably the right answer since it has the both hydrophollic and characteristics.
Not 100% sure though
A polar molecule has a positive and negative end because of electronegativity.
Answer: The answer is federal employees
Explanation: