Q113: Write a short answer for each question. • Expensive Tissue Hypothesis is an important concept that accounts for which major morphological change in the hominin family tree? • What major selective pressures and resource niches are hypothesized to have led to these changes? Be sure to include specific species and their morphological features that support this hypothesis. Note: no copy, no plagiarism write your own words.

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.