A gene cannot react chemically and form a trait without the proper what? Enzyme

Why do bacteria thrive even in hostile environments

Im is in a crowd of people at the mall looking for his girlfriend tammy, who was supposed to meet him for dinner. jim realizes tammy is across the room as he catches a whiff of her overpowering perfume, 'paris #6'. which process explains why jim is able to smell the perfume?

Which describes a grizzly bear’s habitat?