The dutch scientist anton van leeuwenhoek used a microscope that made objects appear 300 times large as they were. if a real cell appeared to be 6 mm long under the microscope, how long was the cell in real life? a.0.02 mm b. 0.05 mm c. 0.20 mm d. 0.50 mm

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.

The negative impacts of nonnative species generally outweigh the positive impacts

This comparative chart is an example of one that might be used by scientists and law enforcement personnel for identification purposes. the chart represents a technological advance called