What is a good 12th grade science fair experiment?

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

In which of the following relationships is one organism always benefited while the other organism is always harmed

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.