Hummingbirds are what they are today as a necessary consequence of their relationship to what?
Options:
- (A) a feeder
- (B) humans
- (C) bees
- (D) survival
- (E) animals
- (F) Plants
- (G) Earth
- (H) weeds
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Let's think first: Some birds are pollinators that co-evolved with plants. Hummingbirds are the most common bird pollinators. Hummingbirds co-evolved with plants.... So the answer is [(F)]

Urine is a product of what organ of the body that is excreted by the urinary system?
Options:
- (A) bowel
- (B) epidermal
- (C) bladder
- (D) alveoli
- (E) lungs
- (F) urine
- (G) mammals
- (H) NaCl
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Let's think first: Urine is the liquid waste product of the body that is excreted by the urinary system. Liquid waste is put into the bladder. Urine is the waste product in the bladder that is excreted by the urinary system.... So the answer is [(C)]

Which has a unique water vascular system?
Options:
- (A) roots
- (B) trees
- (C) Conifers
- (D) Echinoids
- (E) fur seals
- (F) Most plants
- (G) ferns
- (H) bushes
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Let's think first: Echinoderms have a unique water vascular system with tube feet. Another group of echinoderms are the echinoids. Echinoids have unique water vascular system was tube feet.... So the answer is [(D)]

Where can mucus like organisms be found?
Options:
- (A) the environment
- (B) Contaminated wounds
- (C) on food
- (D) on rotting logs and compost
- (E) an area swollen with pus
- (F) in the grass
- (G) in the refridgerator
- (H) mouth of rivers
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Let's think first: Slime molds are fungus-like protists commonly found on rotting logs and compost. True Slime Molds Slime molds are a mucus-like organism. Mucus like organisms can be found on rotting logs and compost.... So the answer is [(D)]

Neurotransmitters and hormones are what in their function?
Options:
- (A) cells
- (B) organic
- (C) inorganic
- (D) complex
- (E) Vibrates
- (F) warm
- (G) properties
- (H) similar
--
Let's think first: Hormones are chemical messengers that control many body functions. Neurotransmitters are chemical messengers in the brain. Hormones and neurotransmitters behave in common ways.... So the answer is [(H)]

What is one reason birds have covered bodies?
Options:
- (A) To help them burrow
- (B) They have thick fur
- (C) layers of fat
- (D) To help them fly
- (E) To keep their body heat.
- (F) To attract predators
- (G) with their fur
- (H) To make them heavier
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Let's think first: Feathers help birds fly and provide insulation. Birds have bodies covered with feathers. Birds bodies are covered to help them fly and provide insulation.... So the answer is [(D)]