Question

listenwater enters the sponge through the __; water exits the sponge through the __.○ osculum; ostia○ ostia; osculumquestion 8 (1 point)listentrue or false.sponges can move from one place to another like all other animals.○ true○ falsequestion 9 (1 point)listentrue or false.all cnidarians have a blind gut (the digestive cavity has one opening).○ true○ falsequestion 10 (1 point)listenwhat do cnidarians used to observe oxygen from the water?○ skin○ nose○ gills

Explanation:

1. For sponge water flow: Ostia are the small pores that let water enter sponges, while the osculum is the larger opening for water to exit.
2. Sponges are sessile organisms, meaning they cannot move freely from place to place like most animals.
3. Cnidarians have a gastrovascular cavity, which is a blind gut with only one opening for both ingestion and excretion.
4. Cnidarians are aquatic organisms that use their thin skin (epidermis) to absorb oxygen directly from surrounding water, as they lack specialized respiratory organs like gills or noses.

Answer:

1. ostia; osculum
2. False
3. True
4. Skin