Archaeopteryx, represents transitional fossil between reptilian and birds
Answer:
A. are all elements the rest are combinations of elements
Explanation:
<h3><em><u>keep the body running smoothly, a continuous concentration of 60 to 100 mg/dL of glucose in blood plasma is needed. During exercise or stress the body needs a higher concentration because muscles require glucose for energy (Basu et al., 2009).</u></em></h3>
If i would have to make an educated guess, i would say C.