The tiny exoskeleton of a diatom is composed mostly of calcium carbonate. a. true b. false

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.

answer; a male inherits only one allele of the x-linked gene controlling hair color;