Unlike firs, pines are a pyrocentric tree. When they experience drought they close their stomata, retain their water and ...

In many cells of the human body, hair-like protrusions known as cilia act as antennae, allowing cells to receive signals from ...

The first animals must also have invented ways to produce the many different kinds of cells we have today; muscle cells, nerve cells, egg cells and sperm to name a few. The division of labour among ...