The process by which plants and animals release stored carbon back into the atmosphere is called

respiration.
diffusion.
photosynthesis.
extraction.

Respiration

Explanation:

The carbon exchange between plants and the atmosphere takes place via:

1) Photosynthesis

2) Respiration

Photosynthesis is a process in which the plants take in carbon in the form of CO2 and water and convert it into glucose along with the release of oxygen (O2). The entire reaction requires energy in the form of sunlight.

Respiration, in contrast involves the breakdown of glucose in the presence of O2 to the release the carbon back in the form of CO2, along with the formation of water and energy.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.