As a child Alex was short for his age but during his teenage years his height increased and he surpassed most of his friends. What must have occurred to create this growth spurt

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones? a) catalysis b) metabolism c) anabolism d) dehydration e) catabolism