Cycles

How do animals get the carbon they need?

• respiration
• digestion
• eating plants
• eating rocks

What can fix nitrogen?

• a capenter
• a mechanic
• lightning
• teacher

What function to legumes perform in the soil?

• photosynthesis
• respirartion
• nitrogen fixation
• combustion

How does carbon from the environment become part of living things?

• respiration
• pollution
• photosynthesis
• transpiration

Why do living things need nitrogen?

• to make new cells
• to get energy
• to eliminate wastes
• to reproduce

What is an important part of DNA?

• carbon
• hydrogen
• nitrogen
• lithium

Which does NOT release carbon dioxide into the environment?

• combustion
• respiration
• photosynthesis
• decomposition

Which are decomposers?

• plants
• animals
• bacteria
• birds

Where does most precipitation fall on earth?

• lakes
• rivers
• oceans
• streams

What do all organic molecules contain?

• oxygen
• carbon
• hydrogen
• nitrogen