What are two of the things human ancestors used the sky for?

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

What maintain homeostasis when a persons internal body temperature is 97.5°f

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