Q: For a technology project, Kyle came up with an idea to build a model bridge. He wants his bridge to span 50 cm and to support a 1 kg object. According to the engineering design process, which of the following should be Kyle's next step? OPTIONS:
- construct prototypes of different kinds of bridges
- research the different designs of bridges
- gather the materials needed to build the bridge
- make a drawing to show how to build the bridge
A: research the different designs of bridges

A strawberry farmer finds that, after a hard freeze, some of his strawberries are still alive. Which best explains why these strawberries were able to survive?
OPTIONS:
- They have larger leaves to protect the fruit than the other strawberries.
- They have different genetic variations that cause them to be more resistant to cold temperatures.
- They are able to reproduce more quickly than the other strawberries.
- The color of the strawberries is darker, and they maintain their temperature better than other strawberries.

They have different genetic variations that cause them to be more resistant to cold temperatures.

Q: Which of the following is most responsible for the decay of dead organisms? ---- OPTIONS:
- water
- mammals
- microorganisms
- nitrogen

A: microorganisms

Denise was driving east over a hill in the afternoon, shortly after a rain shower. Suddenly the sun broke through the clouds, and she saw a rainbow ahead of her. Which of the following made the rainbow possible?
===
OPTIONS:
- Sunlight can be separated into all the colors of the rainbow.
- Water reflects sunlight like a mirror to make it look colored.
- Overhead black clouds reflect in puddles to cause a mirage.
- Air pollution causes the sky to look colored under these conditions.

Sunlight can be separated into all the colors of the rainbow.

Question:
In a food pyramid, which best explains why the number of organisms decreases from one trophic level to the next?
OPTIONS:
- Consumers at the lower level require more energy than the top-level consumers.
- Consumers at the top level require more energy than the lower-level consumers.
- The consumers are feeding on larger organisms that have less energy.
- The consumers are feeding on smaller organisms that have less energy.
Answer:
Consumers at the top level require more energy than the lower-level consumers.

Q: A drain cleaner consists of sodium hydroxide and aluminum. When the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. Which of these best describes what happens to form the bubbles when the cleaner is added to water? F ---- OPTIONS:
- chemical reaction
- Condensation
- A physical change
- Evaporation
A: chemical reaction