A is equal to the length of time it takes Earth to orbit the Sun.
A) day
B) year
C) season
D) lunar cycle

Most of the carbon on earth is stored in the form of

Cells control gene expression at which steps

The term autotroph refers to an organism that: a. uses co2 for its carbon source. b. must obtain organic compounds for its carbon needs. c. gets energy from sunlight. d. gets energy by oxidizing chemical compounds. e. does not need a carbon source