The forelimb structur seen in both bat wings and human arms is very similar to that of an extinct land animal called eusthenopteron this fact suggest that a. bats evolved from humans b. eusthenpteron might be a common ancestor of bats and humans c. in the future bat wings might evolve hand-like limbs d. science is full of coincidences

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

i believe the answer would be b. hope it : )