When in U. S, history did pollution start to become an issue? Explain why pollution was not an issue prior to this time period.

Answer in at least 3 complete sentences.

Some joints such as the ones in your skull do not move at all. Why do you think it is important that skull cannot move

Which structure prevents backflow of duodenal contents into the stomach? A. Pylorus B. Fundus C. Antrum D. Cardia

The body will not get oxygen if which system fails

Definition of tropich level

Which best describes the tongue, ears, and nose? A) sense organs that are part of the central nervous system B) sense organs that are part of the peripheral nervous system C) internal organs that are part of the central nervous system D) internal

If an object with a mass of 100 kg on earth is taken to a planet that has more gravity, how will this affect the object's mass and weight?

Lamarck's mechanism of change can be called

What is carrying capacity and what does it mean for ecosystems?

Why was the evolution of a coelom a critically important innovation for animals? a) The coelom can act as a hydrostatic skeleton. b) The coelom gives rise to a complex nervous system. c) The coelom made it possible for animals to colonize land.

Marine mammals, with a few exceptions, are a. oviparous b. ovoviviparous c. viviparous