Explain how the lungs and circulatory system work together? A. The lungs help with pumping of blood throughout the body.
B. The lungs take in oxygen into the body and the blood distributes oxygen to cells throughout the body.
C. The lungs take in carbon dioxide and blood distributes it to cells in the body. D.
D. Waste product from the blood is expelled out of the body through the lungs.

What is thought to have caused the mass extinction at the end of the cretaceous period?

What causes darkening of the skin as melanin production increases

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms