Question

which of the following is recycled in ecosystems?
energy
sunlight
heat
water
what process allows plants to use carbon dioxide and release oxygen?
respiration
nitrogen fixation
photosynthesis
decomposition

Explanation:

In ecosystems, water undergoes the water - cycle and is recycled. Energy flows through ecosystems in one direction, sunlight is an input, and heat is dissipated. Photosynthesis is the process by which plants use carbon dioxide and release oxygen. Respiration is the opposite process where organisms consume oxygen and release carbon dioxide. Nitrogen fixation is related to nitrogen conversion, and decomposition is about the breakdown of organic matter.

Answer:

1. D. Water
2. C. Photosynthesis