Very powerful microscopes were needed before cells could be observed in detail
By all plants, algae, and some microorganisms
The answer is B. The cardiac, respiratory, and vasomotor
control centers are in the medulla. This means that the medulla controls heart
rate, blood pressure, breathing, and the size of the body's blood vessels. They
have chemoreceptors, pH sensing structures that detect levels of carbon dioxide in the blood and adjust the breathing rate accordingly.
Negative impact on the environment is unnatural, fake
