One is pulmonary one is cellular
I’m pretty sure it’s A
Sorry if I get it wrong but I think it’s A for sure!
Substances formed by joining smaller molecules together are called macromolecules. Examples for macromolecules are: carbohydrates, lipids, nucleic acids, and proteins. They are large biological molecules necessary for life: they power our cells and build our bodies.
Answer:
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.