What vessel branches off the aorta and brings blood into the kidneys

Why is excretion necessary to maintain homeostasis?

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above

What is the one part of the nucleotide  that differs among the other different nucle  tides?