Q: The growth of which of the following usually occurs first in primary succession on a bare rock? OPTIONS:
- Lichens
- Grasses
- Trees
- Shrubs
A: Lichens
What is the most likely outcome of the Moon moving away from Earth?
OPTIONS:
- A lunar day is shorter.
- A lunar eclipse lasts longer.
- Earth moves closer to the Sun.
- Earth's tides decrease in size.

Earth's tides decrease in size.
Q: The gravitational force between two objects depends on the distance between the objects and each object's ---- OPTIONS:
- mass
- volume
- pressure
- temperature

A: mass
Malaria is a common disease in many countries. What is the cause of this disease?
===
OPTIONS:
- a virus
- a bacterium
- a fungus
- a parasite

a parasite
Question:
Pesticides and fertilizers can help farmers to produce more crops. However, overuse of these chemicals can result in
OPTIONS:
- ecological succession
- material recycling
- environmental pollution
- selective breeding
Answer:
environmental pollution
Question:
What is a disadvantage of using moving water to produce electricity?
OPTIONS:
- Power is produced inexpensively.
- Air pollution is produced.
- Oil spills may occur.
- The local ecosystem may be disrupted.
Answer:

The local ecosystem may be disrupted.