PLEASE HELP! 15 POINTS IS ALL I GOT! Select the correct answer.
Scientists recently discovered a species of bacteria that’s capable of photosynthesis, but it’s anaerobic and doesn’t produce or use oxygen for respiration. Which process will be absent in this organism?
A.
Calvin cycle
B.
electron transport system
C.
glycolysis
D.
Krebs cycle

Kreb's cycle is the process which is absent in this type of organisms.

Explanation:

In the presence of oxygen only, the krebs cycle takes place.

In the given bacterial species, there is no usage of oxygen for their respiration process.

The "Electron Transport Chain" is not present in this Photosynthetic anaerobic bacterial species.

Kreb's cycle is one of the most important metabolic pathways which is useful in the production of energy, Whereas the calvin cycle is useful for the process of photosynthesis.

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the right is separation by density .

take the blood which is a good example of a heterogeneous mixture.

blood is a vital liquid in our body, which transports oxygen from the air to our lungs so we can breathe. it is also used to eject wastes, such as carbon dioxide, to bring cells and molecules of the immune system to the tissues, and to spread hormones throughout the body. it corresponds to plasma, red blood cells, white blood cells, platelets and hemoglobins combined.

in medical tests centrifugal force is used to separate the different components of the blood.

in general, the centrifugation will allow to separate and analyze the different components of the blood, to know if the rate of white blood cells in the blood of a patient, for example, is normal, and therefore to know if his system immune is integrity.

under the action of centrifugal force, the solid components in the blood are drawn to the bottom of the tube in which the blood is contained. the centrifugal force then acts as an accelerated settling. it separates plasma from red blood cells and white blood cells.