Science Ch. 1 5th

What are the most abundant elements in living things?

• carbon

• helium

• oxygen

• nitrogen

• hydrogen

A pollutant released into the atmosphere is

• an emission

• a nodule

• acid precipitation

• photosynthesis

• nitrogen fixation

Releasing nitrogen from the soil back into the atmosphere is called

• nitrogen fixation

• cellular respiration

• denitrification

• photosynthesis

converting nitrogen in the atmosphere into a form that can be used by plants is called

• nitrogen fixation

• cellular respiration

• denitrification

• photosynthesis

What type of plant hosts nitrogen-fixing bacteria?

• nodules

• legumes

• corn

• decomposer

The process by which an organism's body releases energy from carbon-base molecules is called

• nitrogen fixation

• cellular respiration

• denitrification

• photosynthesis

Which process describes how plants make sugar from sunlight, water, and carbon dioxide?

• nitrogen fixation

• cellular respiration

• denitrification

• photosynthesis

Air pollution can be caused by burning too many

• emissions

• fossil furls

• nodules

• legumes

When precipitation gathers into a body of water, it is called

• runoff

• collection

• acid precipitation

• photochemical smog

the precipitation that flows over the surface of soil

• runoff

• collection

• acid precipitation

• photochemical smog