Which are the two main parts that make up a chromosome? (A) DNA and genes
(B) DNA and RNA
(C) RNA and phosphate
(D) protein and phosphate

I think it's a I'm not sure though

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.