Why the flow of material in a ecosystem is cyclic but flow i
of energy is unidirectional ?
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the dark variety, as they are not visible on the dark tree barks

explanation:

a. to encourage apoptosis

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds