Secondary succession occurs in which of the following? A. an area where the ecosystem has been completely wiped out by volcanic eruption B. an area where the ecosystem has been badly damaged C. an area through which a glacier has retreated, leaving bare rock

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers