Your friend is scuba diving in Iceland at a mid-oceanic ridge and picks up a rock. He wants to know how old the rock is compared to the rock in Maryland. Explain to your friend which rock is the oldest and how you came to this conclusion. Use evidence from your notes.

Which feature of a human community is similar to a niche in a biological community

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

What is the most abundant vertebrate on earth?