Biology: Age 9

3 illustrated Biology lessons for Age 9.

Mangrove Roots in Mud Mangrove trees grow in soft, muddy ground where the soil has very little air. They use special roots to stand …
Muscles That Hold You Up Even when you stand still, muscles along your neck and back keep pulling to hold your skeleton upright. They w…
Lagoon Oysters and Tide-Flat Oysters In a lagoon, oysters stay underwater all the time. On a coast, the tide pulls the water away and the oysters c…