Two chemical bonds unite three atoms into a molecule. which types of bonds are they?

This type of bonds would be the covalent bonds.

Explanation:

The type of bonds that are made by the sharing of electrons is known as covalent bonds.

For example, A water molecule consists of two hydrogen atoms and a single oxygen atom. Each hydrogen has a single electron whereas oxygen has six electrons in its outermost shell. So, each hydrogen atom shares its electron with the oxygen atom. As a result, each hydrogen gets the required two electrons and oxygen gets eight electrons in its outermost shell.    

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.