In the embryonic stage, what is the term for the inner layer that produces the digestive system, liver, pancreas, and respiratory system?

Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the

How does a lytic infection differ from a lysogenic infection?

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping