Interactions between cells always involve a structure known as a

Interactions between cells always involve a structure known as a connexins.

Explanation:

Connexins is composed of specific type of protein called transmembrane proteins. This structure is responsible for the interaction between the cells. Cells communicate with each other by secreting specific chemicals in which information is present. These chemicals consist of neurotransmitter and harmones.

. ph changes the ability of them he enzyme to dissolve in water.

condenser is used to focus in the light microscope.