Q: Naturally occurring variations within a species are mainly the result of mutations and OPTIONS:
- sexual reproduction
- dynamic equilibrium
- metabolism
- camouflage
A: sexual reproduction

A single prokaryotic cell can divide several times in an hour. Few eukaryotic cells can divide as quickly. Which of the following statements best explains this difference?
OPTIONS:
- Eukaryotic cells are smaller than prokaryotic cells.
- Eukaryotic cells have less DNA than prokaryotic cells.
- Eukaryotic cells have more cell walls than prokaryotic cells.
- Eukaryotic cells are more structurally complex than prokaryotic cells.

Eukaryotic cells are more structurally complex than prokaryotic cells.

Q: Many natural rock formations change color over time. In Utah, for example, iron oxidized and formed red, orange, and yellow rock. Which of the following is the cause of this change? ---- OPTIONS:
- chemical weathering
- mechanical weathering
- water erosion
- wind erosion

A: chemical weathering

Which is the best evidence that cell division is occurring constantly in our bodies?
===
OPTIONS:
- The body has to keep breathing around the clock.
- Active people often require more food than inactive ones.
- There are many different types of tissues in the human body.
- Human beings shed millions of

Human beings shed millions of

Question:
If 1 kg of the compound toluene melts at -95C, then 500 g of toluene will
OPTIONS:
- melt at -47.5C.
- melt at -95C.
- boil at 95C.
- boil at 47.5C.
Answer:
melt at -95C.

Q: What is the frequency of ocean waves that have a speed of 18 m/s and a wavelength of 50 m? ---- OPTIONS:
- 0.18 Hz
- 0.36 Hz
- 2.8 Hz
- 9.0 Hz
A: 0.36 Hz