Which is the best example of tropism in plants a: a stem bending toward sunlight
b: an apple developing from an ovary
c: water moving through vascular tissue
d: carbon dioxide being released from a stem

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Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks