Energy is
a. the same as mass.
b. the capacity to do work.
c. being constantly used up.
d. all of the above

B. The capacity to do work.  

Explanation:

That's the definition of energy.

A. is wrong. Energy is different from mass. However, according to Einstein's famous equation, energy can be converted into mass and vice versa.

C. is wrong. According to the Law of Conservation of Energy, it can be converted from one form to another, but it cannot be destroyed or created.

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.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.