What is this? Please answer with an explanation

B. Human disturbances

Explanation:

Human disturbances is an example of density independent factor. These human disturbances are actually caused by human activities that are carried out by people. These disturbances result to pollution, destruction of habitats, depletion of resources, urbanization, etc.

Density-independent factors are known to be the factors that influences the birth and death rate of the population. This happens regardless of the population density i.e it does not depend on population.

Some of these density-independent factors  are also food or nutrient limitation, climate extremes, pollutants in the environment, etc.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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