sally measures her pulse rate before swimming ten lengths of. a swimming pool she measures it again afterwords what effect will swimming 10 lengths have on her pulse rate

What does the process of natural selection involve

Compare and contrast physical changes with chemical changes.

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.