Answer the following question given this paragraph: White blood cells (WBCs) are usually larger than red blood cells. They do not have hemoglobin and do not carry oxygen. White blood cells make up less than one percent of the blood's volume. Most WBCs are made in the bone marrow, and some mature in the lymphatic system. There are different WBCs with different jobs. WBCs defend the body against infection by bacteria, viruses, and other pathogens . WBCs do have a nucleus and other organelles. Q: Where are most white blood cells made? A:

OPTIONS:
- lungs
- heart tissue
- plasma
- the bone marrow

Answer: the bone marrow

Answer the following question given this paragraph: If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive. Often, error is reported as the absolute value of the difference in order to avoid the confusion of a negative error. The percent error is the absolute value of the error divided by the accepted value and multiplied by 100%. Q: If the experimental value is less than the accepted value, the error is what? A:

OPTIONS:
- positive
- effective
- caused
- negative

Answer: negative

Answer the following question given this paragraph: Combinations of different substances are called mixtures. Q: What are the two components of a mixture called? A:

OPTIONS:
- nutrients and a solvent
- acid and base
- concentration and a solvent
- solute and a solvent

Answer: solute and a solvent

Answer the following question given this paragraph: Another example of habituation is shown below ( Figure below ). Crows and most other birds are usually afraid of people. They avoid coming close to people, or they fly away when people come near them. The crows landing on this scarecrow have become used to a "human" in this place. They have learned that the scarecrow poses no danger. They are no longer afraid to come close. They have become habituated to the scarecrow. Q: A crow that becomes used to a scarecrow and lands on it is an example of what? A:

OPTIONS:
- assimilation
- adaptation
- dissociation
- habituation

Answer:
habituation