Q: You are presented with the quiz "light enters the pupil and makes it what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "light enters the eye through an opening called the pupil" and "light enters the eye through the pupil, and the pupil is made larger or smaller by the iris". So, what's the best answer to the question? | OPTIONS:
- fatter or wider
- larger or smaller
- rapid expansion
- Chemical energy
- It expands
- longer or shorter
- more abundant
- thicker or thinner
A: larger or smaller

Q: You are presented with the quiz "What is the purpose of organs of excretion?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "organs of excretion make up the excretory system" and "urinary system Excretory system removes waste and toxic substances from blood". So, what's the best answer to the question? | OPTIONS:
- Removing waste from blood
- Producing offspring
- storing water
- water conservation
- it protects them
- destroying bacteria
- Circulating blood
- Producing hormones
A: Removing waste from blood

Q: You are presented with the quiz "what do vertebrates have?" 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 "invertebrates are animals without backbones, and vertebrates are animals with backbones". So, what's the best answer to the question? | OPTIONS:
- tails
- strength
- eardrum
- heart
- brain
- Chlorophyll
- back bone
- stamina
A: back bone

Q: You are presented with the quiz "What causes the penis to develop?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "testosterone stimulates the reproductive organs to develop into male organs" and "male mammals have a tube-like organ called the 'penis'". So, what's the best answer to the question? | OPTIONS:
- Creatine
- Energy
- Estrogen
- Testicles
- matter vibrating
- Testosterone
- movement
- It expands
A: Testosterone