What is a way to classify mud found in an ecosystem

The rate at which molecules water and oxygen can enter a cell is determined by the-

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

Which is the function of the hypothalamus in thermoregulation? answers: -sensor -effector -stimulus -intergrating center it's either a or c i believe