Our current understanding of evolution is called a theory because it has been
a. supported repeatedly as new discoveries have been made.
b. proven to be exactly true as originally proposed.
c. corroborated by data that were gathered during a single experiment.
d. developed from the postulates of many scientists.

supported repeatedly as new discoveries have been made. (Option A)

Explanation:

The evolution was proposed by Darwin in the mid eighteen hundreds. The theory of evolution makes two very bold claims about living creatures, first that, all living things are related they evolved from a common ancestor and secondly, the evolution of living things is powered by natural processes. Things which can be studied and understood. Biologists claim that all creatures are closely related and the entire group evolved from ancient 4 legged land mammal.

Supported repeatedly as new discoveries have been made.

Explanation: The theory can be defined as well-substantiated explanation or set of the statements that have been validated over the course of many independent experiments.

The theory of Evolution by Natural selection tells us about of the life forms that is present on earth in they are meant to be.The evolution of species takes place and the changes in the genotype and phenotype of the species are accepted by the nature. The survival of fittest specie and its inheritance still proves this theory of evolution.

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explanation: