Passage Summary: Certain types of sponges are great at living in still water because they can move water themselves, but they are too fragile to survive in rough, wavy areas. These specific sponges were found all over the place during the late Jurassic period.

Reasoning: Tubular and vase-shaped sponges can pump water independently, making them suited for calm waters, but their physical structure makes them unable to survive in strong currents; these sponges were common in the late Jurassic.

Analysis: To find the most strongly supported claim, we must combine the physical requirements of the sponges with the historical fact of their existence. Since these sponges were 'widespread' and we know they 'cannot live in strong currents,' we can reasonably infer that the late Jurassic ocean contained many areas of relatively calm, slow-moving water. Avoid any answer choices that make overly broad claims about all sponges or all time periods. The key is to stay within the narrow intersection of the sponges' biological needs and their historical prevalence.