Photosynthetic cyanobacteria created what important component of the atmosphere?
a. nitrogen
c. oxygen
b. hydrogen
d. carbon dioxide

What is the importantence of the carbon and nitretan cycles in the environment

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

What is one energy transformation that is taking place in the photo? radiant energy to thermal energy thermal energy to nuclear energy chemical energy to thermal energy radiant energy to chemical energy