What has a centralized nervous system with a brain?
Options:
- (A) Birds
- (B) pan
- (C) virus
- (D) sharks
- (E) Man
- (F) trout
- (G) leech
- (H) parasite
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Let's think first: Fish have a centralized nervous system with a brain. Fish include trout and other fish. Trout have a centralized nervous system with a brain.... So the answer is [(F)]


What is considered nonliving?
Options:
- (A) Leptospirosis
- (B) major threat to health
- (C) smallest agent of disease
- (D) harmful substances
- (E) direct damage to the lungs
- (F) Food poisoning
- (G) an area swollen with pus
- (H) loses an electron
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Let's think first: Viruses are usually considered to be nonliving. Viruses Viruses are the smallest agents of disease. The smallest agents of diseases are nonliving.... So the answer is [(C)]


Where is ecosystem complexitiy generally least?
Options:
- (A) humans disturb it
- (B) frontal zones
- (C) in lakes
- (D) at the ocean
- (E) our planet
- (F) at the poles
- (G) mouth of rivers
- (H) at the equator
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Let's think first: Biodiversity generally increases from the poles to the equator. Biodiversity contributes to ecosystem complexity. Ecosystem complexity generally increases from the poles to the equator.... So the answer is [(F)]


How do children learn?
Options:
- (A) reusing materials
- (B) allow growth
- (C) by lying
- (D) Riding a bike
- (E) in many ways
- (F) exercise
- (G) by sleeping
- (H) just one way
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Let's think first: Playing is just one of many ways that mammals and other animals learn how to behave. Children learn through play and in other ways. Children and animals learn in many ways.... So the answer is [(E)]


Streams may start with runoff seeping out of water containing what?
Options:
- (A) chemicals
- (B) Nutrients
- (C) Nitrous oxide
- (D) Helium
- (E) Lithium
- (F) Sulfur
- (G) soil
- (H) Sediment
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Let's think first: Streams may start with runoff or water seeping out of a spring. Sulfur occurs native in the vicinity of volcanoes and hot springs. Streams may start with runoff or water seeping out of a body of water where sulfur occurs.... So the answer is [(F)]


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
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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: 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)]