Which structure conducts photosynthesis?
a. stem
c. roots
b. leaves
d. both a and b

Choose the molecule that is described by each phrase. energy used during long activities:

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes