Final answer:
The supported hypothesis is that daphnia increase their heart rate when given caffeine, as caffeine is known to have a stimulatory effect on the cardiac centers and increase HR.
Step-by-step explanation:
The hypothesis supported by the data is that daphnia increase their heart rate when given caffeine. This can be inferred from the context, which describes the general effects of caffeine and nicotine on organisms. Specifically, caffeine has a stimulatory effect on the cardiac centers and increases heart rate (HR) by increasing the rates of depolarization at the sinoatrial (SA) node.
Given this evidence, we can conclude that the correct hypothesis would be that, similar to the effects observed in humans, when given caffeine, daphnia increases their heart rate. This is consistent with the well-documented excitatory effects of caffeine on the nervous system and cardiac function across various species.The hypothesis that is supported by the data is d. when given caffeine, daphnia increase their heart ratAccording to the information provided, caffeine has a stimulatory effect on the cardiac centers, causing an increase in heart rate. This is supported by the data showing that when daphnia are given caffeine, their heart rate increases