Q: Answer the following question given this paragraph:   A: Other examples of liquid mixtures include salt water and salad dressing. Air is a mixture of gases, mainly nitrogen and oxygen. The rock pictured in the Figure below is a solid mixture.   Q: What two gases are the main components of air?   A:

A: nitrogen and oxygen


Q: Answer the following question given this paragraph:   In everyday speech, the terms accuracy and precision are frequently used interchangeably. However, their scientific meanings are quite different. Accuracy is a measure of how close a measurement is to the correct or accepted value of the quantity being measured. Precision is a measure of how close a series of measurements are to one another. Precise measurements are highly reproducible, even if the measurements are not near the correct value.   Q: In contrast to precision, this term means how close a measurement is to the correct or accepted value of the quantity being measured?   A:

A: accuracy


Q: Answer the following question given this paragraph:   Organs of the lymphatic system include the tonsils, thymus gland and spleen. The thymus gland produces T cells or T-lymphocytes (see below) and the spleen and tonsils help in fighting infections. The spleen’s main function is to filter the blood. The spleen also detects viruses and bacteria and triggers the release of pathogen fighting cells.   Q: What does the thymus gland produce?   A:

A: t cells


Q: Answer the following question given this paragraph:      Q: Upon reaching the postsynaptic membrane, what type of chemical messenger binds to and activates a specific receptor?   A:

A: