2.3 Connectors II: Comparison & Contrast

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Mammals nourish their young with milk; h____, reptiles do not provide food after birth.

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W___s birds have hollow bones for flight, most mammals have solid bones.

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Fish release thousands of eggs into the water; o__ ___ _____ h____, mammals give birth to fewer offspring but care for them extensively.

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• U_____ amphibians, reptiles can reproduce away from water thanks to their amniotic eggs.

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• I_ ______t to reptiles that lay many eggs and leave them unattended, birds guard their nests carefully.

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• A_______ insects are small, they are among the most diverse animal groups on Earth.

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• The frog’s skin must stay moist; ____, the lizard’s scales protect it from drying out. (sin embargo)

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• _____ most plants photosynthesize during the day, CAM plants store carbon dioxide at night. (mientras que)

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• Insects rely on exoskeletons for protection; ________ , vertebrates use internal skeletons. (por otro lado)

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• ______ bacteria, viruses cannot reproduce without a host cell. (a diferencia de)