Plants and snakes live _.
Options:
- (A) almost everywhere
- (B) important habitats
- (C) hydrate their cells
- (D) reproduce
- (E) more abundant
- (F) competing for resources
- (G) the environment
- (H) vegetation
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Let's think first: Plants live just about everywhere on Earth. Snakes live almost everywhere on earth. Plants live just about everywhere snakes do.... So the answer is [(A)]

What lacks respiratory and excretory systems?
Options:
- (A) the Sun
- (B) insects
- (C) starfish
- (D) barnacles
- (E) ferns
- (F) water
- (G) Conifers
- (H) humans
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Let's think first: Echinoderms lack respiratory and excretory systems. Echinoderms are represented by the starfish. Starfish lack respiratory and excretory systems.... So the answer is [(C)]

What do most salamanders use to find a mate?
Options:
- (A) olfaction
- (B) sound
- (C) seduction
- (D) fur and fat
- (E) heat energy
- (F) air
- (G) environment
- (H) water
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Let's think first: Most salamanders use their sense of smell to find a mate. Olfaction is the sense of smell. Most salamanders use olfaction to find a mate.... So the answer is [(A)]

What is one way dogs learn to behave?
Options:
- (A) exercise
- (B) mating
- (C) ligt
- (D) playing
- (E) parties
- (F) slumber
- (G) firm hugs
- (H) Movement
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Let's think first: Playing is one way mammals and other animals learn how to behave. Cats are Mammals that Shed Dogs are Mammals that Wag their tails. Playing is one way dogs learn to behave.... So the answer is [(D)]

What is a process of removing wastes and excess water from the body?
Options:
- (A) hydration
- (B) urination
- (C) incontinence
- (D) trash can
- (E) vaporization
- (F) Cooking
- (G) body waste
- (H) Exfoliation
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Let's think first: Excretion is the process of removing wastes and excess water from the body. Ketones are exhaled and excreted in urine. Urination is a process of removing wastes and excess water from the body.... So the answer is [(B)]

What stimulates the pituitary gland in order to maintain structural integrity of the thyroid?
Options:
- (A) TRH
- (B) Urea
- (C) CO 2
- (D) PDAs
- (E) HPV
- (F) SO2
- (G) mL
- (H) p53
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Let's think first: TRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH. Another function of TSH is to maintain the structural integrity of the thyroid gland. TRH stimulates the pituitary gland to maintain structural integrity of the thyroid.... So the answer is [(A)]