3. Which of the following characteristics apply to all amphibians? (Choose all that apply) lungs instead of gills
O permeable skin
metamorphosis involving two or more distinct stages
ectothermic

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