Drag the tiles to the correct boxes to complete the pairs.
Match each step in the nitrogen cycle to its description.

Explain why phospholipid molecules form a bilayer. (3 marks)

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

What goes in and out of a cell respiration?