Primary producers generally form the smallest trophic level of a pyramid of energy

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

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give