All animals eat to obtain
a. oxygen.
b. ammonia.
c. carbon dioxide.
d. nutrients

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight.which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

Study this image which statement best describes the rock shown check all that apply

What is the difference between a meteoroid and a meteor?