Fact 1: An organism requires energy for growth. Fact 2: Different organisms have different growth requirements and growth rates. Given the two facts above, what is a requirement whose amount varies between organisms?

OPT:
(1). food;
(2). energy;
(3). existence;
(4). entropy;
(5). sunlight;
(6). H20;
(7). entity;
(8). Energy.;
Answer:
(2).