Oxygen<span>, </span>sulfur<span>, </span>nitrogen<span>, and </span>hydrogen<span>.
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Answer:
the right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.
Answer:
Millions of years ago, the Appalachians were taller than the Himalayas! Millions of years of erosion, however, have taken their toll. ... The crust that is now the Appalachians began folding over 300 million years ago, when the North American and African continental plates collided.
it would be C because kingdom is animalia, phylum is chordata, class is mammalia and order is carnivora and humans and tigers are both carnivors