Arrange the layers in order from youngest to oldest.

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.

69 is the correct math for the amino acids

answer; synapse; i believe this is correct,plz check first good luck;