NEED HELP ASAP Which of the organisms below must perform cellular respiration to survive?

A. Tree

B. Bird

C. Human

D. Bacteria

E. Fish

[Need an explanation to with the answer no links]

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which formula can be used to calculate the molar mass of hydrogen peroxide

Earth's axis of rotation is tilted at an angle of 23.5 degrees. what is one change you would see on earth if its axis was not tilted?