Which describes how the atoms in living things cycle? Multiple choice question.

A)
through living parts of ecosystems only

B)
in one direction from living to nonliving parts of the ecosystem

C)
in one direction from nonliving to living parts of the ecosystem

D)
repeatedly back and forth through living and nonliving parts of the ecosystem

D) repeatedly back and forth through living and nonliving parts of the ecosystem

Explanation:

Matter is contained in both living and non-living components of the Earth. An atom is the smallest indivisible component of every matter. This means that matter is made up of atoms.

In an ecosystem, organisms feed on one another in order to survive. However, as they do this, matter is transferred from one organism to another. This transfer of matter (atoms) occurs repeatedly repeatedly back and forth in a cyclical manner through living and nonliving parts of the ecosystem.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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