question... What provides food and shelter to many ocean organisms?
Options:
- (A) It helps them survive
- (B) Something formed from skeleton
- (C) sedimentary rocks
- (D) important habitats
- (E) Something with a head, thorax, and abdomen
- (F) it protects them
- (G) gastropod shells
- (H) in their habitats
answer... Coral reefs provide food and shelter to many ocean organisms. Coral reefs are formed from coral skeletons. Something formed from skeletons provide food and shelter to many ocean organisms.
The answer is (B)

question... Which type of system do most animals without backbones have?
Options:
- (A) sensory neurons
- (B) Veins and arteries.
- (C) Nervous system
- (D) Stereo system
- (E) Root system
- (F) to move people
- (G) Skeletal system
- (H) insects
answer... Most invertebrates have a nervous system. Invertebrates are animals without a backbone. Most animals without backbones have a nervous system.
The answer is (C)

question... What does an adult sponge have?
Options:
- (A) gills
- (B) Length
- (C) polyps
- (D) Energy.
- (E) alveoli
- (F) a cuticle
- (G) retina
- (H) Energy
answer...
Adult sponges are sessile. Polyps can be peduncular or sessile, and are usually viral in origin. Adult sponges have polyps.
The answer is (C)