P16 is an example of what type of thing that causes cancer when it stops functiong properly?
Options:
- (A) Toxins
- (B) edema
- (C) gene
- (D) ferns
- (E) CO 2
- (F) PDAs
- (G) HIV
- (H) albino
--
Let's think first: Cancer is a disease that occurs when the cell cycle is no longer regulated. P16 is a regulator of the cell division cycle. Cancer is a disease that occurs when genes like P16 stop functioning properly.... So the answer is [(C)]

A thing that is what makes up the excretory system.
Options:
- (A) matter
- (B) vital
- (C) omniscient
- (D) external
- (E) toads
- (F) food
- (G) always angry
- (H) animals
--
Let's think first: Organs of excretion make up the excretory system. All internal organs are vital organs. A thing that is internal and vital make up the excretory system.... So the answer is [(B)]

What is larger than ponds?
Options:
- (A) rivers
- (B) deltas
- (C) H 2 O
- (D) loch
- (E) toads
- (F) drop
- (G) puddle
- (H) bird bath
--
Let's think first: Lakes are generally bigger and deeper than ponds. Scotland s lochs , including the famous Loch Ness, are glacial lakes. Lochs are bigger and deeper than ponds.... So the answer is [(D)]

What involves a sperm and egg fusing to form a diploid zygote?
Options:
- (A) Leptospirosis
- (B) produce offspring
- (C) allow growth
- (D) sexual reproduction
- (E) metabolic reaction
- (F) peachleaf willow
- (G) rapid expansion
- (H) Plant reproduction
--
Let's think first: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Sexual reproduction requires formation of gametes, followed by fertilization. Sexual reproduction involves a sperm and egg fusing to form a diploid zygote.... So the answer is [(D)]

What interferes with cooling of the body?
Options:
- (A) low humidity
- (B) snow
- (C) ice
- (D) Sulfur dioxide
- (E) Leptospirosis
- (F) Smoking
- (G) heat or cold
- (H) high humidity
--
Let's think first: Sweat wets the skin, and when it evaporates, it cools the body. High humidity interferes with evaporation of the sweat. High humidity interferes with cooling of the body.... So the answer is [(H)]

What does population size influence on a species?
Options:
- (A) Quality of life
- (B) their migration pattern
- (C) their home
- (D) characteristics
- (E) Plant reproduction
- (F) their chance of living
- (G) their food preference
- (H) metabolic reaction
--
Let's think first: Population size influences the chances of a species surviving. Survival is to live, to live means hope. Population size influences the chances of a species living.... So the answer is [(F)]