Problem:OPTIONS:
- weathering
- bears
- snakes
- dogs
- ants
- humans
- monkeys
- goats

You are presented with the quiz "what conserves body heat with their hair or fur?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mammals conserve body heat with their hair or fur" and "all monkeys are mammals". So, what's the best answer to the question?
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A: monkeys

Problem:OPTIONS:
- DNA
- all copper
- air
- space
- RNA
- coat
- heat
- gasoline

You are presented with the quiz "What helps cells survive?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cells cannot survive without oxygen" and "air contains oxygen". So, what's the best answer to the question?
****
A: air

Problem:OPTIONS:
- grass
- multi-celled organisms
- seeds
- Something that causes allergies
- major threat to health
- single-celled organisms
- microorganisms
- Food poisoning

You are presented with the quiz "Bacteria and archaebacteria examples of what?" 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 "bacteria and archaebacteria are prokaryotes". So, what's the best answer to the question?
****
A: single-celled organisms

Problem:OPTIONS:
- deforestation
- kill them
- Pollution
- disease
- deadly
- erosion
- migration
- flooding

You are presented with the quiz "Natural disasters can cause " But you don't know the answer, so you turn to your teacher to ask for hints. He says that "natural disasters can cause animals to leave an environment" and "animal migration is mystery of nature". So, what's the best answer to the question?
****
A:
migration