Nitrogen in the cells of plants and animals is first released to other organism with the of
a)denitrifying bacteria
b)nitrogen-fixing bacteria
c)nitrifying bacteria
d)decomposers

What is the next step in muscle contraction after the actin changes shape? (apex)

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin

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