When salt and sugar dissolve in water it is a physical change. The chemical makeup of the salt and sugar are not changed.
Physical change
Answer:
The genetic variations that are best suited for their enviornment
Explanation:
Those that are not well suited for their environment will die off, leaving only the ones that are suited for it. This species will slowly take hold until the species has adapted and become a completely different one.
The lungs are functioning to take carbon dioxide out of the body. Also known as exhaling.
Answer:
The answer is juxtamedullary nephrons. Hope this helps.
