Which of the following statements about sunspots is false?
a. they are areas of the sun that are "burnt out."
c. they are cooler than the surrounding areas of the sun.
b. they occur on the surface of the sun.
d. they occur in cycles.

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.

Which of the following is the best definition of aerobic respiration? o a. the cellular process that releases energy by breaking down glucose o b. physical activity that involves the repeated motion of large muscle groups o c. physical activity that increases heart rate and breathing rate o d. the cellular process that converts solar energy to chemical energy

Which type of respiration takes place when there is no oxygen present