The variation that arises is directed toward fixed goals, so that a species evolves in a predetermined direction by some kind of internal drive, without the aid of natural selection. This hypothesis is known as,

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#Question id: 4589

#Section 2: Evolution

Darwin used the phrase "descent with modification" to explain ________.

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#Question id: 4574

#Section 2: Evolution

Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are

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#Question id: 8851

#Section 2: Evolution

Why is territoriality an adaptive behavior for songbirds maintaining populations at or near their carrying capacity?

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#Question id: 16765

#Section 5: Applied Ecology & Evolution

The relation between exposure and disease is considered to be causal or etiological in the following, except

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#Question id: 12147

#Section 2: Evolution

Climax forests