Enzymes a) are composed of long chains of fatty acids. b) can be destroyed by variations in temperature or ph. c) are used up, in the process of performing a chemical reaction. d) raise the amount of energy required to start a chemical reaction.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /