Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Isometric exercise is a sustained contraction of large muscles, such as weight lifting. Given the two facts above, weigh lifting requires muscles?

OPTIONS:
- to move people
- Energy.
- stamina
- it needs them
- shortening
- hydration
- sensory neurons
- Energy

Answer: shortening

Problem: OPTIONS:
- feet
- speed
- size
- bills
- Limbs
- beaks
- wings
- Tail
Q: Fact 1: Webbed feet are used for moving faster through water by aquatic animals. Fact 2: All ducks have webbed feet. Given the two facts above, ducks can move fast through the water due to their specialized what?
Answer: feet

Problem:OPTIONS:
- hair and skin
- sensory neurons
- an organism's body
- animals
- volume and plants
- gravity and clouds
- density and humans
- Veins and arteries.

Fact 1: All cells share some of the same structures and basic functions. Fact 2: Hair cells are also a type of skin cell. Given the two facts above, what shares some of the same structures and basic functions?
****
A: hair and skin

Fact 1: Darkness has a negative impact on photosynthesis. Fact 2: Plants use photosynthesis to make food. Given the two facts above, what negatively affects plant life?
OPTIONS:
- toxins
- darkness
- fertilizer
- water
- Pesticides
- Smoking
- Pollution
- sunlight
darkness

Fact 1: Chromosomes contain genes, which code for proteins. Fact 2: Genes are arranged in gene clusters. Given the two facts above, chromosomes contain what?
OPTIONS:
- all matter
- spectrum
- Energy.
- adrenaline
- nerve cells
- clusters
- Energy
- skin cells

Answer: clusters

input with options: Fact 1: Fish have a centralized nervous system with a brain. Fact 2: Nervous A reptile has a brain and nervous system. Given the two facts above, what organs do both fishes and reptiles have?
OPTIONS:
- legs
- they all walk on land
- gills
- the eyes
- protected
- brains
- alveoli
- vision
output:
brains