What part of an atom is made up of protons and neutrons?

Nucleus

Explanation:

the nucleus of an atom consist of protons and neutrons,the electrons is located at the electron shells of an atom

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.