What is one way carbon is taken out of the atmosphere?
A. Plants and animals decay
B. Weak acid rain
C. Respiration from plants and
animals
D. Volcanoes

Which of these organisms have the greatest amount of cell specialized

List five ways we are indebted to phytoplankton

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d