In eukaryotic cells, which are found in complex organisms including humans, little membrane-bound organelles carry out various functions. It's been suggested that these organelles, which all have ...

A SCHOLARLY and thoughtful book like this makes one feel how much is lost to students of biology by lack of attention to the historical development of the science. Not only is the human interest ...

Embryonic germ layers are the fundamental organizing principle in animal development. They provide the structural basis from which tissues and organs arise. During early embryogenesis, cells divide to ...

The field of paleobiology and the study of ecological diversity have some new data and it's proving to be quite different from what most theories of animal evolution have previously posited.