Question

3.4 what does primary productivity measure? what information about ecosystems does it give you?

Explanation:

Primary productivity measures the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs into organic substances. It gives information about the health and stability of an ecosystem. High primary productivity indicates a healthy ecosystem with abundant resources for other organisms. It also shows the amount of carbon - fixation happening, which is important for the global carbon cycle.

Answer:

Primary productivity measures the rate of conversion of energy into organic substances by autotrophs. It gives information about ecosystem health, resource availability, and carbon - fixation rates.