Discover the different types of cells found in animals and what their role is. Learn about nerve cells, ciliated cells, muscle cells and more. Specialised plant cells Discover the different types ...

Bacteria are among the smallest living things. A single bacterium consists of just one cell. Not all bacteria are harmful. There are different unicellular organisms and types of bacteria.

Darwin's theory of natural selection provides an explanation for why organisms develop traits that help them survive and reproduce. Because of this, death is often seen as a failure rather than a ...