Enzymes increase the rate of which chemical reactions occur. 

This is a substrate complex/lock and key hypothesis as well. When the substrate and enzyme bind the enzyme goes through a conformational change. Then two products emerge. 

Evaporation- liquid water turns into gas and goes into the sky as it warms

Transpiration- similar to evaporation. Water that was in plants comes out of them in the form of water vapor. 

Condensation- turning of liquid water into gas. As warm air rises it cools, condensing to form cloud droplets (clouds are produced)

Precipitation- occurs when cloud particles become to heavy to stay in the air and come down to Earth-- cooling and becoming liquid. 

Runoff-flowing of rain water to large water sources. 

Animals: Arctic fox, snowy owl, grizzly bear

Climate: Treeless, cold throughout year, snowy

Location: Arctic (Canada, Alaska, etc.)

Plants: Arctic willow, arctic moss

Animals: Blackbear, bobcat, bald eagle

Plants: Balsam fir, black spruce, douglas fir

Location: Arctic (less arctic than tundra)

Climate: Cold all year long and snowy