Which of the following is a way humans have impacted the rain forest but not the tundra

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?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.