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.

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

9. the history of life on earth is recorded in