Q: Which is the most basic unit of living things? OPTIONS:
- Cells
- Bones
- Tissues
- Organs
A: Cells

During a lab investigation, students were asked to determine the best way to clean up an oil spill using different materials. Investigation Materials filter paper foam sponge metal wire screen thin sock filled with hair The students tested the materials by placing each material into separate buckets containing oil and water. They recorded their observations on which material absorbed the most oil. Why would the students' teacher ask them to repeat their tests?
OPTIONS:
- to determine if water and oil can be separated
- to learn more about how to protect wildlife during an oil spill
- to improve the chances of obtaining accurate oil cleanup results
- to increase the total amount of oil removed from each container

to improve the chances of obtaining accurate oil cleanup results

Q: Typically, sedimentary rocks are formed ---- OPTIONS:
- only in erupting volcanoes.
- only under great pressure and high temperatures.
- below Earth's surface as magma cools and crystallizes.
- from materials that settle.

A: from materials that settle.

In clear weather, a bright light can be seen for a long distance. In conditions of heavy fog, the visibility is greatly reduced. Which of the following explains the reduced visibility?
===
OPTIONS:
- Light is refracted by water vapor in the air.
- Light is scattered by water droplets in the air.
- Light is absorbed by water vapor near the ground.
- Light is reflected by water droplets on the ground.

Light is scattered by water droplets in the air.

Question:
Which is a major function of the vacuoles found in cells?
OPTIONS:
- to store water and food for cells
- to release energy for cells
- to control what enters and leaves cells
- to provide protection for cells
Answer:
to store water and food for cells

*Question*: What is the smallest unit of an element that still has the properties of that element? OPTIONS:
- an atom
- a compound
- an electron
- a molecule
*Answer*:
an atom