PLEASE HELP :) Can someone please explain what primary production is? Also what does sink/source/flux/ and egestion mean? (Can an organism be a sink/source and flux at the same time or is an organism only supposed to be one or the other?

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

Asap many people try to eliminate fat from their diets which is one reason it is necessary for humans to eat fat a) fat is the only way to get energy b) every cell in the body must contain fat c)fat stores less energy than polysaccharides d) saturated fats make blood vessels healthier

Which u.s. state lists the horned toad as its state reptile?