Plants have small pores on the underside of their leaves, known as stomata. When the sun rises, these pores open and the plants absorb carbon dioxide (CO 2) from the atmosphere, which they need, in ...

To balance an unbalanced equation, you need to add numbers to the left of one or more formulae. Here is one way to work out how to do this for the reaction between nitrogen and hydrogen.

In order for trees to grow, they need to control their water balance meticulously. A study shows how trees react to drought -- and revises previous perceptions. In order for trees to grow, they need ...