Why are there more species in Family Ursidae than there are in Genus Ursus?

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Explanation:

The family Ursidae contains the genus Ursus, which includes 4 species of bear, the brown bears, the polar bear and the two species of black bear.

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.