question... What lacks a centralized nervous system?
Options:
- (A) starfish
- (B) barnacles
- (C) blowfish
- (D) our planet
- (E) humans
- (F) Pesticides
- (G) insects
- (H) sharks
answer... Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.
The answer is (A)

question... When snow falls to the ground and soaks into the ground, what can it become?
Options:
- (A) steam
- (B) ice
- (C) Sediment
- (D) thermal heat
- (E) dangerous
- (F) flooding
- (G) groundwater
- (H) rainfall
answer... Some precipitation that falls on land may soak into the ground, becoming groundwater. Most of the precipitation falls as snow. Some snow that falls on land may soak into the ground becoming groundwater.
The answer is (G)

question... What animal found on earth would belong to the phylum platyhelmintes?
Options:
- (A) bilaterally symmetrical worms
- (B) Something with a head, thorax, and abdomen
- (C) remains of prehistoric life
- (D) Something that makes plants green
- (E) Microscopic organisms
- (F) female sex cells
- (G) it helps plants in growing
- (H) share properties
answer...
Flatworms belong to the phylum Platyhelminthes. Flatworms are bilaterally symmetric. Bilaterally symmetric worms belong to the phylum Platyhelminthes.
The answer is (A)