Problem: OPTIONS:
- the middle
- the ocean
- the bank
- the source
Q: Q: Where is the potential energy of a river the highest at? A:
Answer: the source

Problem:OPTIONS:
- biological
- renewable
- untapped
- nonrenewable

Q: What type of resource cannot be replaced as easily as it is consumed? A:
****
A: nonrenewable

Q: What causes acid rain? A:
OPTIONS:
- carbon dioxide
- heavy pollution
- chemicals in waterways
- air pollution
air pollution

Q: Passive immunity arises from the transfer of what to an individual, without requiring them to mount their own active immune response? A:
OPTIONS:
- parasites
- bacteria
- viruses
- antibodies

Answer: antibodies

Question: Q: Lava flows from a volcano and hardens into what? A:
OPTIONS:
- life
- snow
- sand
- rock
Answer: rock

input: OPTIONS:
- reject foreign bodies
- fight or flight
- heal wounds
- to keep out pathogens Now, answer this question: Q: What is the purpose of your body's first line of defense? A:
A:
output:
to keep out pathogens