question: Which is immobile?
Options:
- (A) adult starfish
- (B) all matter
- (C) adult goldfish
- (D) gastropod shells
- (E) tadpoles
- (F) adult sponges
- (G) an object
- (H) an organism's body
answer: Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are immobile.
The answer is (F)

question: What can decompose a bow?
Options:
- (A) Acids
- (B) Oak
- (C) CO 2
- (D) pine
- (E) erosion
- (F) Wind
- (G) water
- (H) Fungi
answer: Fungi are the only organisms that can decompose wood. Bows are wood, and wood breaks. Only fungi can decompose bows.
The answer is (H)

question: What kind of cell division produces sex cells in animals?
Options:
- (A) complex
- (B) insects
- (C) pollen
- (D) gametes
- (E) sexual division
- (F) meiosis
- (G) reproduction cells
- (H) seeds
answer: Meiosis is the type of cell division that produces gametes. Animals that reproduce sexually produce sex cells, or gametes. Meiosis is the type of cell division that produces sex cells.
The answer is (F)

question: What is an example of an echinoderm?
Options:
- (A) a fish
- (B) eel
- (C) starfish
- (D) parasites
- (E) ferns
- (F) shark
- (G) fertile
- (H) algae
answer:
Echinoderms have a unique water vascular system with tube feet. Each starfish arm is lined with tube feet. Starfish are an echinoderm with a unique water vascular system.
The answer is (C)