Problem:OPTIONS:
- bushes
- mines
- alpacas
- bamboo
- toads
- ferns
- veins
- legumes

You are presented with the quiz "what have very little pressure?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "blood pressure is highest in arteries and lowest in veins" and "blood moves slowly and with very little pressure in veins". So, what's the best answer to the question?
****
A: veins

Problem:OPTIONS:
- food
- water
- meat
- bacteria
- calcium
- nucleus
- animals
- Animal fur

You are presented with the quiz "In what are proteins made?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ribosomes are small organelles where proteins are made" and "ribosomes are assembled inside the nucleus". So, what's the best answer to the question?
****
A: nucleus

Problem:OPTIONS:
- Lift
- magnetism
- mass
- matter
- wind
- orbits
- energy
- forces

You are presented with the quiz "What pulls objects towards planets is created by " But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gravity pulls objects towards planets" and "gravity is created by mass". So, what's the best answer to the question?
****
A: mass

Problem:OPTIONS:
- athletes
- humans
- gases
- bacteria
- sharks
- baseball
- people
- offspring

You are presented with the quiz "what learns how to behave by playing?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "playing is one way mammals and other animals learn how to behave" and "all humans are mammals". So, what's the best answer to the question?
****
A:
humans