The variation in living primates provides models for understanding: a. morphology, behavior, and adaptation in the evolutionary past. b. the uses of anatomical and genetic evidence. c. levels of anatomical complexity. d. alternative forms of classification.

The variation in primates provides models for UNDERSTANDING morphology, behavior, and adaptation in the evolutionary past (Option a).

Primates represent an Order of mammals that include many species such as lemurs, tarsiers, monkeys, apes, and humans.

According to the variation in morphological traits, primates can be classified into two groups: prosimians (e.g., lemurs and tarsiers) and anthropoids (e.g., monkeys, apes, and humans).

Some behavioral features used to classify and study the evolution of primates include, among others, grooming, social dominance, cooperative foraging, ritualized courtship, mating behavior, etc.

Finally, primates can be evolutionarily analyzed by a series of adaptations including acute vision, bipedalism, depth perception, climatic adaptations, arboreal vs ground-dwelling species, etc.

In conclusion, the variation in primates provides models for UNDERSTANDING morphology, behavior, and adaptation in the evolutionary past (Option a).

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