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In the 17th century, Gregor Mendel crossed pea plants with different traits and observed the results in their offspring. To which of these did Mendel contribute most directly with his work?

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Which of these describes a small range in the electromagnetic spectrum?

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Tony is studying ladybugs in a garden. Which of these would BEST help Tony to count the spots on a ladybug?

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Vascular plants have tissue called xylem. Which of these is transported by the xylem?