All living things need to maintain a certain limited set of conditions inside their cells because they rely on the action of enzymes, these include:

Define STIMULUS

Define RESPONSE

A slow environmental change such as the seasons will result in...

The environment of internal cells and tissues in animals is...

How is the composition of tissue fluid maintained by the blood?

Why is it important to monitor concentrations of waste and all substances?

Why is a multicellular organism more efficient than a single-celled organism?

What makes a good communication system?

How do cells communicate with each other?

What are the two major communication systems that work by cell signalling?

What is the neuronal system?

What is the hormonal system?