Sponges attach to the ocean floor, continually filtering seawater for food and ejecting water they have just filtered to avoid reingesting it. βββββββ βββ βββββββββββ βββββββ βββ βββββ ββββββββ βββββ βββββββ ββββββββββ ββββ βββββββββββ βββββ ββββββββ βββ ββββ βββ βββββββ ββ ββββββββββββ βββββ βββββββ βββββββ ββ βββββ ββββββ ββββββββ βββββ βββββββ ββββββ ββββ ββ ββββββ βββββββββ βββββ ββββββ ββββββββ βββββ ββββββββ βββββ ββββ ββ βββββ βββββββββ ββ ββββββ ββββ ββββββββββ ββββββ βββ ββββ ββββββββ βββββββ
Sea sponges live on the ocean floor and feed by filtering water. Two sponge types (tubular sponges and vase-shaped sponges) can filter feed without help from the current, so they do well in quiet waters. They also canβt live in stronger currents, because they would be dislodged from the ocean floor. Finally, both tubular and vase-shaped sponges were widespread in the late Jurassic period.
These facts strongly support the conclusion that the late Jurassic period had many areas of ocean floor with slow currents, thus allowing tubular and vase-shaped sponges to be widespread. They also support the conclusion that areas with slow currents can still have enough fresh water moving through for sponges to find food.
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All sponges that βββ βββββββ βββββββ βββ βββββββββββ βββββββ βββββ ββ βββ βββββ βββββ βββββ βββββ βββ βββββββββ ββββββ βββββββββ
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