Basaltic magma is very fluid. what type of volcano and eruption would basaltic magma most likely produce?
a. composite, an explosion of lava and pyroclastic flow
b. shield, a lava flow with no explosion
c. cinder cone, a pyroclastic flow with no explosion
d. shield, an explosion of lava

Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall

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.

Which description provides the best objective summary of the article in the passage?