Q: What explains why water molecules tend to stick together? A:
OPTIONS:
- helium bonds
- covalent bonds
- mineral bonds
- hydrogen bonds
hydrogen bonds

Q: Where do most ecosystems get their energy from? A:
OPTIONS:
- earth
- heat
- water
- sun

Answer: sun

Question: Q: What property of an object is obtained by multiplying its mass and its velocity? A:
OPTIONS:
- fluid
- component
- movement
- momentum
Answer: momentum

input with options: Q: Vertebrates differ from invertebrates because they lack this? A:
OPTIONS:
- legs
- head
- neck
- backbone or a spinal column
output: backbone or a spinal column

Q: Q: What is the functional unit of the kidney which actively filters blood and generates urine? A:

OPTIONS:
- sechron
- epithelial
- mecrophron
- nephron

A: nephron

Q: Refraction happens when light bends from doing what in a new medium? A:
OPTIONS:
- changing brightness
- changing color
- changing trajectory
- changing speed
changing speed