Which term names an underground area that collects and holds a large amount of water? a. divide b. basin c. watershed d. aquifer

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.

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?