Why does secondary succession usually occur more rapidly than primary succession.

When the volume and number of particles of a gas are constant which of the following is also constant

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth