Answer:
Here's three just in case. The three core principles of evolution – variation, heredity, and differential fitness – crystalized in the 1970s, still serve as a conceptual benchmark for the theory of evolution by natural selection.
Explanation:
dehydration.
the body is loosing more fluid than it is able to keep in and extreme cases result in death
D
the circulatory absorbs nutrients and carries the chemical to signal through endocrine to control the speed of digestion.
oxygenated blood is pumped to the body by the left ventricle.
