This is an ecological pyramid that shows graphically the population of each tropic level in a food chain

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

Variety of living organisms; includes genetic, species, and ecological types.