question... Fertilization occurs when _ fuse.
Options:
- (A) fertile
- (B) sperm ducts
- (C) heat
- (D) eggs
- (E) seeds
- (F) gametes
- (G) pollen
- (H) ovaries
answer... Fertilization occurs when a sperm and an egg fuse. Sperm and eggs are cells known as gametes. Fertilization occurs when gametes fuse.
The answer is (F)

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 has a centralized nervous system with a brain?
Options:
- (A) Birds
- (B) pan
- (C) virus
- (D) sharks
- (E) Man
- (F) trout
- (G) leech
- (H) parasite
answer...

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Fish have a centralized nervous system with a brain. Fish include trout and other fish. Trout have a centralized nervous system with a brain.
The answer is (F)