why do new species evolve more rapidly after a mass extinction? a. few organisms survive, which allows the remaining organisms to reproduce rapidly. b. mutations increase during mass extinctions, which then increase the rate of evolution. c. ecological niches become available for organisms to evolve into by adaptive radiation. d. there is a lot more food available, so the remaining organisms are able to flourish.

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.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.