You are presented with the question "What can people die without?" and the following answer choices: - water - h2o - family - retina - love - oxygen - friends - food Now knowing that arteries generally carry oxygen-rich blood and without a blood supply, people are in danger of dying, choose the best answer.
oxygen
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You are presented with the question "What is used to perceieve light inside the pupil" and the following answer choices: - an electron lens - It expands - Receptor Cells - heat energy - Energy. - focusing a lens - sensory neurons - observe it Now knowing that when light enters the eye through the pupil , that light falls on the retina and receptors are cells in the retina that perceive light, choose the best answer.
Receptor Cells
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You are presented with the question "What is one of the facets of an organism's evolution?" and the following answer choices: - resistance - fitness - properties - thirst - movement - swimming - offspring - recycling Now knowing that behaviors that improve fitness increase through natural selection and many organism behaviors have evolved through natural selection, choose the best answer.
fitness
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You are presented with the question "How do dogs conserve body heat?" and the following answer choices: - their blood cells - fur and fat - their nails - layers of fat - Exfoliation - sweating - their fur - their hair Now knowing that mammals conserve body heat with their hair or fur and dogs, of course, are mammals, choose the best answer.
their fur
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