input: OPTIONS:
- sensory neurons
- the body's largest organ
- a vertebral column
- wings
- legs
- Chlorophyll
- a cuticle
- reproductive system Now, answer this question: You are presented with the quiz "What do insects lack?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "invertebrates are animals that lack a vertebral column, or backbone" and "insects are the most common invertebrates". So, what's the best answer to the question?
A:
output: a vertebral column
You are presented with the quiz "What can cause harm?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "competition may lead to aggressive behaviors or displays of aggression" and "aggression is the desire or intent to cause harm". So, what's the best answer to the question?

OPTIONS:
- Sulfur dioxide
- burning coal
- Medical treatment
- treats
- Good feelings
- cigarettes
- competition
- emissions

Answer: competition
Problem: OPTIONS:
- thorns
- H2O
- weathering
- rain
- CO2
- H20
- flow
- urea
Q: You are presented with the quiz "what is forced against a seed coat causing the root to emerge?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the force of water against the seed coat causes a root to emerge from a seed" and "water is made up of H2O molecules". So, what's the best answer to the question?
Answer: H2O
Problem:OPTIONS:
- attract a mate
- Reproduction
- protect them
- kill predators
- avoid planes
- survive
- population movement
- gather friends

You are presented with the quiz "Instincts help animals to do what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an animal needs to attract a mate to reproduce" and "instincts help animals find food, mate, reproduce, and raise their young". So, what's the best answer to the question?
****
A: attract a mate
You are presented with the quiz "An animal which may have one or two hearts to pump blood is:" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mollusks have a circulatory system with one or two hearts that pump blood" and "interestingly, a squid is also a mollusk". So, what's the best answer to the question?
OPTIONS:
- squid
- goats
- bats
- mammals
- toads
- Birds
- edible
- a fish
squid
You are presented with the quiz "What are single celled organisms that do not have a nucleus?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "prokaryotes are single-celled organisms that lack a nucleus" and "prokaryotes are usually microscopic and bacteria is an example of a prokaryote". So, what's the best answer to the question?
OPTIONS:
- Most plants
- nucleus
- ferns
- fossil fuels
- bushes
- Eukaryotes
- leech
- bacteria

Answer:
bacteria