It took millions of years for coal to form. The process began when giant plants died. What happened to the plants RIGHT AFTER this? A)They turned into sedimentary rock.
B)They sank to the bottom of swamps.
C)They hardened because they lost oxygen.
D)They changed because of pressure and heat.

What came first the elephent or the crocodile

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen