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.

Q: A plant produces tiny plants around the edges of its leaves. When these tiny plants fall to the ground, they take root and become new plants. This process is an example of ---- OPTIONS:
- sexual reproduction
- asexual reproduction
- evolution
- extinction

A: asexual reproduction

Q: Rocks that contain fragments of bones, shells, and plant remains are most likely ---- OPTIONS:
- crystals.
- igneous.
- sedimentary.
- metamorphic.

A: sedimentary.

Q: Scientists use models that show the features of an atom. A scientist should use a model that ---- OPTIONS:
- was the first to be developed
- was most recently developed
- shows the arrangement most clearly
- shows the details needed for a specific purpose
A: shows the details needed for a specific purpose