Which question can be answered by science?
a. why do paper bags look better than plastic bags?
b. should scientists be allowed to do genetic research?
c. how much pesticide is safe to use on plants?
d. how should you feel about using plastic bags?

C. how much pesticide is safe to use on plants.

Explanation:

Every other answer its used by science.

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.