The cleanest and best grade of coal is called

The most common type of coal is called _____ coal.

Water falls to the earth as

A __________ is an example of erosion that is caused by gravity

Organisms grow and replace cells through the process of

Part of a plant cell that is not found in animal cells is the ___________

A ___________ invented the first microscope

___________________ developed a system of classification.

The jellylike substance inside the cell membrane is called ___________

The circular organelle that contains the DNA is the __________

This kingdom contains the smallest living organisms.

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