Which is an average number? -relative atomic mass
-atomic number
-mass number
-nucleaonic number

Depending on the organism the number of in a cell may change

Which example describes a mutualistic relationship between organisms? young wasps prey on caterpillars. crabs eat the remains of dead fish. tapeworms feed on food in the intestines of cats ants protect a tree on which they feed.

All other things being equal the size of a population will decrease if