A paleontologist discovers fossilized animal remains that give strong evidence t

Question

A paleontologist discovers fossilized animal remains that give strong evidence that the organism had a large, well-formed, most likely 4-chambered heart, with no connection between the right and left sides. Which of the following could most reasonably be hypothesized from this observation A) The animal and its relative must have evolved from early birds. B) The animal had high energy requirements and was endothermic. C) The animal was definitely closely related to specific reptiles, including the crocodile and caiman. D) The animal was undoubtedly an invertebrate. E) The animal had little reason to regulate its blood pressure. The condition in which embryos, not eggs, are retained within the mother's body is termed. A) oviparity B) ovovivipary C) vivipary In mammals, oxygenated blood returning from the lungs enters the of the heart through the. A) right atrium; vena cavae B) left atrium; vena cavae C) right atrium, aorta D) right atrium; pulmonary vein E) left atrium; pulmonary vein

Explanation / Answer

5)B)The animal has a high energy requirement and was endothermic

6)B)OVOVIVIPARY

Ovoviviparity, ovovivipary, or ovivipary, is a mode of reproduction in animals in which embryos that develop inside eggs remain in the mother's body until they are ready to hatch.

7)E)LEFT ARTIUM:PULMONARY VEIN.

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