Q: In which oceanic zone do clams and crabs survive by burrowing in the sand? OPTIONS:
- oceanic
- intertidal
- deep ocean
- open ocean
A: intertidal

How do scientists know that some mountains were once at the bottom of an ocean?
OPTIONS:
- Freshwater rivers flow to the ocean.
- Saltwater fish are found in some mountain streams.
- Dinosaur bones have been discovered in the mountains.
- Marine fossils have been found on the peaks of some mountains.

Marine fossils have been found on the peaks of some mountains.

Q: A balloon filled with helium gas is set free and starts to move upward. Which of the following best explains why the helium balloon moves upward? ---- OPTIONS:
- The density of helium is less than the density of air.
- The air resistance lifts the balloon up.
- There is no gravity acting on the helium balloons.
- The wind blows the balloon upward.

A: The density of helium is less than the density of air.

The Moon has the greatest effect on Earth's
===
OPTIONS:
- year
- seasons
- ocean tides
- daylight hours

ocean tides

Question:
The nucleus of MOST atoms consists of
OPTIONS:
- neutrons only
- protons and neutrons
- protons and electrons
- neutrons and electrons
Answer:
protons and neutrons

Q: A cat jumps when startled by a loud noise. This is an example of an organism ---- OPTIONS:
- sensing and responding to its external environment
- sensing and responding to its internal environment
- changing and controlling its external environment
- changing and controlling its internal environment
A: sensing and responding to its external environment