How do Earth's crust and mantle differ? A. The crust is thinner and less dense
B. The crust is thinner and denser
C. The mantle is thicker and less dense
D. The mantle is thinner and denser
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Which identifies the main purpose of biological taxonomy?

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled

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