How do male dogs mark their territory?
Options:
- (A) Chemical energy
- (B) Hot dog eating contest
- (C) Adequate signage
- (D) with their fur
- (E) Scent marker
- (F) heat produced
- (G) mate with females
- (H) Paint
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Let's think first: Male dogs use pheromones in urine to mark their territory. During Urination Dog's urine is used as a scent marker for other dogs. Male dogs mark their territory with a scent marker.... So the answer is [(E)]

Meiosis is the type of _ that produces ova and spermatozoa.
Options:
- (A) permineralization
- (B) an organism's body
- (C) animals
- (D) Plant reproduction
- (E) Most plants
- (F) Chemical energy
- (G) rapid expansion
- (H) cell division
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Let's think first: Meiosis is the type of cell division that produces gametes. Examples of gametes are ova and spermatozoa. Meiosis is the type of cell division that produces ova and spermatozoa.... So the answer is [(H)]

Which of the following affects neurons?
Options:
- (A) nerves
- (B) voltage
- (C) Dehydration
- (D) electrically
- (E) heat
- (F) Botulism
- (G) fever
- (H) temperature
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Let's think first: Neurons are the structural and functional units of the nervous system. Botulism affects the nervous system. Botulism affects neurons.... So the answer is [(F)]

What can mutations cause?
Options:
- (A) death and devastation
- (B) blood
- (C) massive damage
- (D) Leptospirosis
- (E) biological diversity
- (F) horses
- (G) ice
- (H) out of control growth
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Let's think first: Cancer cells divide more often than normal cells, and grow out of control. Cancer is an example of a mutation in cells. Mutation can cause growth out of control.... So the answer is [(H)]

What wets the skin, and when it evaporates, it cools the body?
Options:
- (A) Heat energy
- (B) salt and water
- (C) acetic acid
- (D) urine
- (E) ice
- (F) Chlorophyll
- (G) white vinegar
- (H) blood
--
Let's think first: Sweat wets the skin, and when it evaporates, it cools the body. Sweat is made of salt and water. Water and salt wets the skin, and when it evaporates, it cools the body.... So the answer is [(B)]

Humans have collected and grown what for food for thousands of years?
Options:
- (A) plants
- (B) fungi
- (C) ferns
- (D) cheese
- (E) fungus
- (F) salmon
- (G) hamburgers
- (H) primates
--
Let's think first: Humans have collected and grown mushrooms for food for thousands of years. Mushrooms are an example of fungi. Humans have collected and grown fungi for food for thousands of years.... So the answer is [(B)]