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Space
Anatomy
100

This planet is closest to the sun.

Mercury.

100

The human heart has this many chambers.

4.

200

The largest planet in our solar system.

Jupiter.

200

Adult humans typically have this many bones.

206.

300

This planet is known as the red planet.

Mars.

300

Adult humans typically have this many teeth.

32.

400

This planet is the farthest in our solar system from Earth.

Neptune.

400
The only part of the human body that cannot repair itself.

Teeth.

500

This planet is known as the hottest planet.

Venus.

500

The powerhouse of the cell.

Mitochondria.