Which biotic factor would be most effective in maintaining homeostasis in an ecosystem 1. The absence of large trees
2. The presence of many ponds
3. The presence of many species
4. The absence of predators

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Identify the terms using the following picture. principle of dominance item 1 can be described as the . item 2 can be described as the . the "p" represents from one parent.

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?