Q: Which is true of scientific discoveries? OPTIONS:
- All scientific discoveries are based solely on observation and never experimentation.
- Sometimes scientific discoveries are made by accident, like the discovery of penicillin.
- If a scientist cannot provide the exact time and place his or her discovery was made, it is dismissed.
- All scientific discoveries are regulated by government agencies, like the Food and Drug Administration.
A: Sometimes scientific discoveries are made by accident, like the discovery of penicillin.

Two pure substances combine to make a new substance. The new substance cannot be physically separated and has a different boiling point than each of the original substances. This new substance can best be classified as
OPTIONS:
- an atom.
- a mixture.
- an element.
- a compound.

a compound.

Q: Which of the following is found in all living organisms? ---- OPTIONS:
- cell
- organ
- organ system
- tissue

A: cell

Data indicate that chemical pollutants contaminate 53% of the waterways that empty into the Chesapeake Bay. These chemical pollutants are found in the tissues of animals living in the bay. Which group of people who live away from the bay might be most affected by these chemical pollutants?
===
OPTIONS:
- people who walk near the bay
- people who read books about the bay
- people who consume fish from the bay
- people who own boats docked in the bay

people who consume fish from the bay

Question:
Cats are most closely related to which of the following animals?
OPTIONS:
- crocodiles
- whales
- frogs
- penguins
Answer:
whales

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