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Early land animals had both lungs AND gills, and their bodies consisted of few hard parts. Meaning they lacked things like an exoskeleton for instance. Animals today have either lungs OR gills and many have protecting hard parts of their bodies.
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The Answer is C. stratosphere
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During nitrogen fixation, bacteria breaks nitrogen gasses down into a usable form for plants.
Answer: About 1 in 200,000 people in the United States are born with syndrome A ... Prevalence, The prevalence of a gene mutation or a genetic disorder is the ... Can a change in the number of genes affect health and development
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