Which of the following is not true concerning the flow of energy through an ecosystem

D. Most of the energy from photosynthesis flows out as heat

Explanation:

Energy flow is the amount of energy that moves through a food chain in a given ecosystem

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.