Which of the following is not a measurement of a wave? * A. Frequency
B. Period
C. Knots
D. Height

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.

then that particular organisms become extinct.