Ecology

An underground layer of rocks or sand that can hold groundwater.

• watershed
• levee
• aquifer
• erosion

This is essential to living organisms, it is found in nucleic acid and amino acids.

• Nitrogen
• Carbon
• Water
• Phosphorous

What are the four most important materials needed by living organisms?

• water, carbon, oxygen, nitrogen
• water, food, oxygen, carbon
• water, carbon, nitrogen, phosphorous
• water, carbon, food, phosphorous

This is part of nucleic acids, ATP, and helps form animals' bones and teeth.

• Nitrogen
• Carbon
• Water
• Phosphorous

The conversion of ammonium to nitrate is called what?

• nitrification
• renitrification
• denitrification
• unnitrification

The conversion of nitrate to nitrogen gas is called what?

• nitrification
• renitrification
• denitrification
• unnitrification

What is it called when water vapor cools and changes into a liquid?

• condensation
• respiration
• precipitation
• evaporation

Which of the following is NOT a stage of the nitrogen cycle?

• organisms breathe in nitrogen gas
• organisms release nitrogen compounds via waste or decomposition
• bacteria convert unusable nitrogen to usable nitrogen
• plants absorb nitrogen compounds from the soil

The three steps of the water cycle include:

• condensation, precipitation, filtration
• filtration, irrigation, evaporation
• precipitation, condensation, evaporation
• precipitation, filtration, evaporation

Which of the following is NOT part of the carbon cycle?

• condensation
• photosynthesis
• combustion
• respiration