Describe how photosynthesis provides food for ecosystems?

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.