Which species is likely to exhibit random dispersion? a. rushes that grow on the edges of bodies of water b. orchid plants that grow on the branches of a particular tree species c. squirrels that actively defend their territory against other squirrels d. frogs that live along the edges of ponds and streams e. sweetgum, a tree species with wind-dispersed seeds

A

dandelions with seeds dispersed by the wind

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.