Problem:OPTIONS:
- pearls
- algae
- swea
- otters
- fish
- humans
- sharks
- sponges

Fact 1: Fish have a centralized nervous system with a brain. Fact 2: Amphetamines stimulate the central nervous system. Given the two facts above, what water dweller can be stimulated with amphetamines?
****
A: fish

Problem:OPTIONS:
- Battery useage
- exposure to the sun
- Emitting an excess of contaminants
- they travel great distances
- Using too much gas
- Causing accidents
- depress neuronal excitability
- within and around

Fact 1: Using a car causes pollution. Fact 2: Pollution is a damaging excess of contaminants. Given the two facts above, how do cars damage the environment?
****
A: Emitting an excess of contaminants

Problem:OPTIONS:
- nerve cells
- protist
- animals without backbone
- remains of prehistoric life
- members of their own species
- sensory neurons
- Veins and arteries.
- bacteria

Fact 1: Most invertebrates have a more complex nervous system. Fact 2: Invertebrates are animals without a backbone. Given the two facts above, what mostly have a more complex nervous system?
****
A: animals without backbone

Problem:OPTIONS:
- viruses
- the Sun
- sharks
- bacteria
- humans
- frogs
- bears
- Birds

Fact 1: Amphibians have sense organs to smell and taste chemicals. Fact 2: Frogs are classified as amphibians. Given the two facts above, what have sense organs to smell and taste chemicals?
****
A:
frogs