Answer:
"Survival of the fittest" is a phrase that originated from Darwinian evolutionary theory as a way of describing the mechanism of natural selection. The biological concept of fitness is defined as reproductive success.
Explanation:
Answer:
The esophagus is a long tube that connects the mouth to the stomach
Fossil fuels and green house gases which burn holes in the ozone layer of the atmosphere causing global warming
The macromolecule would probably be the carbohydrate.
