Which term is defined as the sum of protons and neutrons in an atom? O atomic number O balance number O charge number O mass number​

Astudent conducts an experiment to determine how the amount of water given to a plant affects it growth what is the dependent variable for this experiment

Nucleic acid certain protein cell membranes certain carbohydrates

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.