Hydrogen bonds can form due to polar covalent bonds in the water molecule.

The monomers of proteins are

Which four elements are most common in living organisms?

An ecosystem includes only all living components of an area.

A good hypothesis is testable and _______________

What is considered the fundamental unit of life?

Biologists recognize life through a series of properties shared by all living things.

A virus is considered alive

Biologists consider an object to be alive as long as it displays two of the properties of live.