The tobacco mosaic virus cannot _ by itself.
Options:
- (A) migrate
- (B) reproduce
- (C) move
- (D) consume
- (E) It expands
- (F) animals
- (G) survive
- (H) respirate
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Let's think first: Viruses cannot reproduce by themselves. Viruses include the Tobacco Mosaic Virus. The Tobacco Mosaic Virus cannot reproduce by itself.... So the answer is [(B)]


What size are cells?
Options:
- (A) either huge or tiny
- (B) non existent
- (C) dense
- (D) large
- (E) white
- (F) tiny
- (G) dead
- (H) albino
--
Let's think first: Cells vary in size as well as shape, but all cells are very small. Atoms are tiny particles that are too small to see. Cells vary in size as well as shape, but all cells are very tiny.... So the answer is [(F)]


What is a source of drinking water?
Options:
- (A) ice expanding in rock openings
- (B) helping to prevent floods
- (C) industrial runoff
- (D) it helps plants in growing
- (E) Water seeping out of a spring
- (F) salt water
- (G) polluted water
- (H) Something with a head, thorax, and abdomen
--
Let's think first: Streams may start with runoff or water seeping out of a spring. Lakes and streams are sources of drinking water. Water seeping out of a spring is a source of drinking water.... So the answer is [(E)]


What does head hair prevent the loss of?
Options:
- (A) matter
- (B) chemicals
- (C) energy
- (D) sunlight
- (E) Nutrients
- (F) warmth
- (G) humidity
- (H) sweating
--
Let's think first: Head hair is especially important in preventing heat loss from the body. Basically, heat is energy. Head hair is especially important in preventing energy loss from the body.... So the answer is [(C)]


What is a chemical element essential for good health?
Options:
- (A) sweating
- (B) light energy
- (C) oxygen
- (D) bioaerosols
- (E) Chlorophyll
- (F) hydration
- (G) Potassium
- (H) fever
--
Let's think first: Minerals are chemical elements that are essential for body processes. Potassium is a trace mineral essential for growth and good health. Potassium is a chemical element essential for good health.... So the answer is [(G)]


What may become unbalanced if the rate of breathing is too fast or too slow?
Options:
- (A) meiosis
- (B) rain levels
- (C) photosynthesis
- (D) blood acidity
- (E) an organism's body
- (F) Veins and arteries.
- (G) kinetic energy
- (H) swamp vegetation
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think first: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. Acidity is measured with a pH meter or with pH paper strips. Blood acidity may become unbalanced if the rate of breathing is too fast or too slow.... So the answer is [(D)]