Scientists Have Hypothesized That the Common Ancestors of Birds and Mammals

question 27

Multiple Choice

Scientists have hypothesized that the common ancestors of birds and mammals, possessed three-chambered hearts (two atria, one ventricle) . Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles) . Which of the following statements best describes the four-chambered hearts of birds and mammals?

• A) they are morphological homologies
• B) they exhibit molecular homology
• C) they are morphological analogies
• D) they are the result of shared ancestry

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Definitions:

Organic Inferiority

A concept suggesting that individuals are motivated to overcome physical or psychological deficiencies perceived as inherent weaknesses.

Gifted

Individuals, often children, who demonstrate outstanding levels of aptitude or competence in one or more domains.

Sibling Rivalry

Competition, jealousy, and conflict among brothers and sisters which may involve striving for parental attention, love, or approval.

Illness

A condition of poor health perceived or experienced by an individual, often characterized by disease, dysfunction, or disorder.