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Visualizing the scale of human cells compared to Earth's circumference.

A human silhouette next to a microscope showing a 20-micron cell, with a line extending to Earth, illustrating that 37.2 trillion human cells placed end to end would circle the Earth 40,075 km.

JPG 850×477 160.4 KB Free · Personal Use

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(view all cells the building blocks of life worksheet answers)