The two main ideas of ecosystems: the flow of energy and the cycling of materials Energy enters the biological system as light energy, or photons, is transformed into chemical energy in organic molecules by cellular processes including photosynthesis and respiration, and ultimately is converted to heat energy.
(Energy; enters; the biological system) (the flow of energy and the cycling of materials Energy enters the biological system as light energy, or photons; is transformed; into chemical energy; by cellular processes including photosynthesis and respiration) (The two main ideas of ecosystems; is converted; to heat energy; T:ultimately)
Energy the flow of energy and the cycling of materials Energy enters the biological system as light energy, or photons The two main ideas of ecosystems
enters is transformed is converted
the biological system
into chemical energy by cellular processes including photosynthesis and respiration
to heat energy T:ultimately