What Is Soil?
Soil is a mixture of very small pieces of rock and rotted materials from plants and animals. This rotting plant and animal material, called humus, gives soil its dark...
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Why Do Plants Have Sap?
Why Do Plants Have Sap? Sap is the liquid that enables trees and other plants to live and grow. The roots of a plant draw water, along with dissolved minerals, from the...
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How Do Trees Grow Taller?
How Do Trees Grow Taller? Trees grow by producing new cells in a very limited number of places. These places of cell division are called meristems. Meristems are...
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