Which of the following statements is true of all organisms in every environment?
O A.
They must compete for essential resources.
B.
They avoid interaction as much as possible.
C.
They are able to produce their own food.
D.
They must consume other organisms for energy
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A.  They must compete for essential resources.

Explanation:

The correct answer for the fill in the blank is- C) Racism.

Racism is a system of belief ( doctrine), which indicates that the characteristics and capacities of human beings can be determined through their race ( that includes physical traits, culture and traditions, ethnicity).

Racism produces difference among races by indicating some superior and others as inferior race.

Therefore, C) is the right answer.