Season are caused by 

• tropical storms
• the tilt of the Earth's axis with respect to the sun 
• wind patterns

A major influence on climate is

• large bodies of water
• craters
• moonlight

When gas, oil, and coal are burned, _________ is released into the atmosphere.

• hydrogen
• carbon dioxide
• chlorofuorcarbon

Very few species can adapt to _______________.

• warm weather conditions
• extreme cold, as found in the polar regions
• summer

One cause of ________ may be deforestation. 

• thunderstorms
• global warming
• clouds

Planetary cooling can happen because of 

• tides
• winds
• volcanic eruptions

el Nino causes 

• sea level to fall
• stronger trade winds
• ocean temperatures to increase off the coast of Peru

An animal that hibernates

• reduces its activinty in hot summer
• reduces its activity in cold weather and winter
• has thin fur

Opposite extremes of day and night temperatures are associated with _________

• deserts
• the greenhouse effect
• the tropics

All of the following are examples of behavioral  adaptations EXCEPT for 

• people freezing
• deforestation 
• hibernation