-Dr. Walter Snelling discovered in 1911 -it is a gas becomes a liquid under moderate pressure or when cold
-it is a portable energy source used in Barbecue grills in hot air balloons

what is it?

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

How does a lytic infection differ from a lysogenic infection?