How do scientists theorize that cyanobacteria affect the development of endosymbiosis?

Cyanobacteria are primitive organisms where chloroplasts are believed to be originated. Now, with the theory of endosymbiosis, this suggests that these organelle from cyanobacteria was engulfed by other organisms which has helped them process light with the help of chloroplasts.

Naturally acquired active, Live, primary, Artificially acquired active, Artificially acquired passive, Antibodies, Naturally acquired passive

Explanation:

Immunity refers to the state of being resistant to infection or reinfection with a pathogen

It can be passive or active immunity.

Active immunity can be Naturally acquired active immunity when a person is exposed to live pathogens,manifests the disease and due to primary immune response they become immune. Artificially acquired active immunity is through vaccination.

Passive immunity can be Naturally acquires passive immunity where a fetus gets some antibodies from maternal blood stream and becomes immune to certain pathogens. Whereas Artificially acquired passive immunity is when an individual is injected with antibodies such as gamma globulin.