Can someone please help me? Thanks! (no links please) How are the economies of South America similar? How are they different?

The cluster of developing cells from conception until birth is called an

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone