Q: You are presented with the quiz "Different behavior patterns cause a fight-or-flight response in what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "threatening behavior causes a fight-or-flight response in animals" and "different behavior patterns are used by a threatened rabbit". So, what's the best answer to the question? | OPTIONS:
- courtship
- ecosystems
- biomes
- Species
- Mammal
- animals
- trees
- humans
A: animals

Q: You are presented with the quiz "What does the process of urination require?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "urine leaves the body through a sphincter in the process of urination" and "urination requires relaxation of the sphincter muscle". So, what's the best answer to the question? | OPTIONS:
- aerobic capacity
- relaxation of muscles
- the looseness of soil
- sunlight
- air
- metabolic reaction
- blood
- Converting waste.
A: relaxation of muscles

Q: You are presented with the quiz "Mutation in a gene pool is the raw material for what" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mutation creates new genetic variation in a gene pool" and "genetic variation is the raw material for evolution". So, what's the best answer to the question? | OPTIONS:
- Most plants
- animals
- large litters
- competition
- Plants growth
- many offspring
- evolution
- twins
A: evolution

Q: You are presented with the quiz "Plastic and other mulches offer a barrier to what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "spores may be dispersed by moving water, wind, or other organisms" and "plastic and other mulches offer a barrier to spore dispersal". So, what's the best answer to the question? | OPTIONS:
- contamination
- Animal survival
- erosion
- Deposition.
- spores moving
- bacteria
- environment
- high temperature
A: spores moving