Biology

Which of the following is on the lowest level of ecological organization?

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How many chromosomes does a typical human body cell have?
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How many pairs of ribs are in a typical human body?
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What type of plants always contain a xylem and phloem?
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Where is the largest snake, the anaconda, found?
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Why are many flowers brightly colored?
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What natural biological defense system protects the body from disease and fights off germs?
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What "trapdoor" on your windpipe helps keep out food particles?
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Which of these body systems helps your body keep its shape and gives protection?
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