The four galilean moons were discovered in the year 1610, but the next moon of jupiter to be discovered, amalthea, was not found until 1892. the distinction that was most responsible for the early discovery of the galilean moons was their: a. orbital speeds. b. orbital periods. c. average orbital radii. d. diameters.

Give the biological term for: structures that display characteristics of living organisms only within living cells

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

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.