Answer:
D. Variations.
Explanation:
Variation is defined as having any modification caused by environmental factors.
This is exemplified particularly in the Charles Darwin and the finches that he found at Galapagos Island, which essentially had 4 groups of finches with varying size beaks, from the smallest to largest:
1) Green Warbler Finch
2) Small Tree Finch
3) Medium Ground Finch
4) Large Ground Finch.
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What is found is that, depending on the types of available food, a species may adapt towards eating that particular food source in an effort to keep oneself alive. Any useful traits, therefore, would be passed down through generations, while those who failed to adapt would die out.
However, it is important to note that while variation can be seen, and holds some truth to it, Darwinism theory as a whole is not scientific, as the layering of fossil records does not coincide with the theory itself. Evolution, if it was to have occurred, should evolve in such a way that organisms with similar characteristics should be found in order, rather than modifications found in multiple layers. It is also noteworthy that the Darwinist theory calls for only those who are able to adapt to be able to survive, and that unnecessary traits would, sooner or later, be dropped. However, this is not the case, particularly with humans, as humans take part in many leisurely activities that have no benefit towards one's own survival. Darwin's suggestion is that heritable traits that help organisms survive would be the only ones passed down, but humanity as an example shows that such ideas are in fact not true.
Learn more about the Darwin Theory, here:
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