Q: How many types of mechanical waves are there? Choices: - five - nine - one - three A:
three

Q: Which glands sit atop the kidneys and are composed of an outer cortex and an inner medulla, all surrounded by a connective tissue capsule? Choices: - gonads - salivary - thyroid glands - adrenal A:
adrenal

Q: Q: All the atoms of a given element have the same number of what in their nucleus, though they may have different numbers of neutrons? Choices: - molecules - electrons - compounds - protons A:
A: protons

Question: Q: The change in the characteristics of living things over time is known as _________ Choices: - spontaneous mutation - variation - generation - evolution A:
Answer: evolution

*Question*
Q: What historical event taught people that soil could be lost by plowing and growing crops and encouraged new methods to prevent erosion? Choices: - the debris bowl - the flow bowl - the land bowl - the dust bowl A:
**Answer**
the dust bowl

*Question*
Q: What structure is made from dna and protein molecules coiled together? Choices: - bacterium - enzymes - atoms - chromosome A:
**Answer**
chromosome