A. electrons b. megatrons c. neutrons d. protons

Q: The model shows parts of an atom. What term identifies the parts of the atom labeled with a Y?

A:  You're answer is electrons.

Note that there are 3 parts to an atom. The Protons, Neutrons, and Electrons.

As King Jupiter states, each part have a charge:

The Proton has a positive charge

The Neutron does not have a charge

The Electron has a negative charge

The Protons and Neutrons are located towards the center (in the sphere like), and is compacted together. The electrons, on the other hand, orbits the what is identified as X.

Note: Electrons have a smaller mass than Protons and Neutrons, which means that the gravitational pull of the Protons and Neutrons allow the Electrons to keep inside the atom.

hope this helps

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

cell division is not regulated in tumor cells.