Which of the following is a necessary reactant
for cellular respiration to occur? (2 points)
oxygen
nitrogen
carbon dioxide
water

The correct answer is- Oxygen

Explanation:

In cellular respiration one glucose molecule is oxidized into 6 molecules of carbon dioxide and 6 molecule of water . This oxidation of glucose release energy which is used to make ATP. ATP is the form of energy which can be be used by the cell to perform its metabolic function.

The reactants that are necessary for cellular respiration are C₆H₁₂O₆ and O₂ and the product of cellular respiration is CO₂, H₂O, and ATP. Some of the energy released during the oxidation of glucose in cellular respiration is released as heat in the surrounding.

Therefore the oxygen is the necessary reactant for cellular respiration to occur.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.