When the central vacuole in a plant cell is full, the cell becomes a) rigid b) wilted c) shriveled d) none of the above

How does the molecular clock work? a. it analyzes the brain functionality of two different species. b. it examines and compares the physical characteristics of two different species. c. it illustrates relationships between two different species. d. it compares the number of mutations that exist in the dna of two different species.

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?