Some lizards have different size legs.  Lizards with longer legs are able to better access food.  Overtime Lizards with short legs became less common.What is the inherited variation?

Ferns are considered among the most primitive of vascular plants because they do not make seeds

The extracellular matrix is found:

Integrins are involved in which function?

How is necrosis different from apoptosis in terms of cell structure changes?

Uncommitted cells that can differentiate and undergo a controlled series of changes into different cell types.  

What is the process by which undifferentiated cells become specialized for specific functions?

Neurons are an example of:

A heart attack will cause which of the following?

_________________the unique set of  resources used by a species, which includes its interactions with other species