Which of the following is an organic molecule?

A. NaCl
B. H2O
C. FeO
D. CH4

D.CH4

Explanation:

Methane (CH4) is the prototypical organic molecule. Stick drawings of methane and some other organic molecules follow. Although uncommon, there are organic compounds that don't contain a C-H bond. For example, CCl4 is almost always classified as organic.

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.