input: OPTIONS:
- chlorophyll
- enzymes
- cytoplasmic acid
- salicylic acid Now, answer this question: Q: What do willow trees produce to kill bacteria? A:
A:
output: salicylic acid

Q: What is the collective travel of sheep known as? A:

OPTIONS:
- gaggle
- load
- den
- herd

Answer: herd

Problem: OPTIONS:
- membrane
- muscle
- fiber
- cartilage
Q: Q: What is the tough tissue that contains collagen? A:
Answer: cartilage

Problem:OPTIONS:
- effective variable
- essential variable
- independent variable
- dependent variable

Q: In a scientific experiment, the variable that is affected by the other one is called what? A:
****
A: dependent variable

Q: What term is used to describe a region getting significantly less precipitation than normal for an extended period of time? A:
OPTIONS:
- dog days
- doldrums
- flood
- drought
drought

Q: What is the term for disease-causing agents, such as bacteria and viruses? A:
OPTIONS:
- spores
- parasites
- vaccines
- pathogens

Answer:
pathogens