The organ above is responsible for filtering wastes from the digestion of proteins and cleaning the blood of excess salts. it is found in the lower back. it is the and is part of the system.
a) liver; excretory.
b) liver; digestive.
c) kidney; excretory.
d) kidney; digestive.

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca