What is a source of energy for chemosynthesis?
a. sunlight
b. oxygen
c. electromagnetic radiation
d. carbon dioxide
e. methane
Question 2How much of the light that reaches Earth's surface is captured by organisms?
a. One part in 2
b. One part in 20
c. One part in 200
d. One part in 2,000
e. One part in 20,000