What is an organism's niche? a. the physical environment of the organism b. the role that an organism plays in c. the environment the traits that increase an organism's survival o d. the competitors and predators of the organism

In what for do plants utilize nitrogen? why do they need nitrogen?

The relationship between intron and exon

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes