Answer: okay what's your problem
Hypothesis: large servings might encourage children of today to eat more data and sugars than children ate a generation ago
Carbon dioxide, but you can minimize this by adding a paraffin lamp (this could also raise the temp. and stop heat as a limiting factor)
I guess it would be the sun?
The answer is organism.
Reason why:
A species is an environment of related organisms. A community is a population of common goals. A population is a headcount of how many animals there are of one animal kind.
