1. What is a lifestyle practice that can benefit the lymphatic system?

A. Consuming a high-sugar diet
B. Maintaining a sedentary lifestyle
C. Regularly engaging in moderate exercise
D. Smoking cigarettes

Correct answer: C

Rationale: The correct answer is C: Regularly engaging in moderate exercise. Exercise can benefit the lymphatic system by promoting circulation and the movement of lymph fluid throughout the body. This helps to remove toxins and waste products, improving overall lymphatic function. Consuming a high-sugar diet (A) can have a negative impact on the lymphatic system by increasing inflammation and impairing immune function. Maintaining a sedentary lifestyle (B) can lead to poor lymphatic circulation and fluid retention. Smoking cigarettes (D) is harmful to the lymphatic system and overall health, as it can impair immune function and increase inflammation.

2. What property of matter remains constant regardless of changes in its state?

A. Mass
B. Volume
C. Density
D. Weight

Correct answer: a

Rationale: Mass remains constant for a given amount of matter, regardless of its state (solid, liquid, or gas) or its location in the universe. Explanation of other options:

3. Which property of a substance refers to its ability to be hammered or pressed into thin sheets without breaking?

A. Malleability
B. Ductility
C. Viscosity
D. Conductivity

Correct answer: a

Rationale: Malleability is the property that describes a substance's ability to be hammered or pressed into thin sheets without breaking.

4. What is the least common multiple (LCM) of 4 and 6?

A. 24
B. 12
C. 6
D. 3

Correct answer: B

Rationale: The LCM is the smallest number that is a multiple of both 4 and 6. We can find this by listing out the multiples of each number until we find a common value. In this case, 12 is the first number divisible by both 4 (4 x 3) and 6 (6 x 2).

5. The electrical conductivity of a strong acid solution is higher than that of a weak acid solution because:

A. Strong acids are more concentrated.
B. Strong acids release more hydrogen ions
C. Weak acids are better at dissolving salts.
D. Strong acids have a lower pH.

Correct answer: B

Rationale: Strong acids completely dissociate, leading to a h

6. What is the waxy or oily substance produced by sebaceous glands that helps lubricate the skin and hair?

A. Keratin
B. Melanin
C. Sebum
D. Sweat

Correct answer: C

Rationale: The correct answer is C: Sebum. Sebum is a waxy or oily substance produced by the sebaceous glands in the skin. It helps lubricate and waterproof the skin and hair, preventing them from drying out. Keratin is a protein found in the skin, hair, and nails, providing structure and strength. Melanin is a pigment that gives color to the skin, hair, and eyes. Sweat is produced by sweat glands and helps regulate body temperature by cooling the skin through evaporation. In this question, sebum specifically refers to the substance produced by sebaceous glands, making it the correct answer.