Which animal has a backbone?
Options:
- (A) camels
- (B) snail
- (C) bats
- (D) cricket
- (E) a fish
- (F) bird
- (G) koalas
- (H) octopus
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Let's think first: Birds are endothermic tetrapod vertebrates. Animals with backbones are called vertebrates. All birds have backbones.... So the answer is [(F)]

What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish
--
Let's think first: Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.... So the answer is [(G)]

Plant growth, biodiversity, and adaptations of land organisms is influenced by:
Options:
- (A) sun's heat
- (B) fossils
- (C) Greenhouse gasses
- (D) animals
- (E) global warming
- (F) the environment
- (G) Darwin
- (H) Greenhouse gases
--
Let's think first: Climate influences plant growth, biodiversity, and adaptations of land organisms. Global warming is a part of climate change. Global warming influences plant growth, biodiversity, and adaptations of land organisms.... So the answer is [(E)]

What can liquid waste be?
Options:
- (A) gas
- (B) Gaseous
- (C) Solid
- (D) Acidic
- (E) acid rain
- (F) expelled
- (G) Static
- (H) dangerous
--
Let's think first: Urine is the liquid waste product of the body that is excreted by the urinary system. Acid urine is usually darker thatn alkaline urine. Liquid waste can be acidic.... So the answer is [(D)]

What kind of animal would be an endothermic tetrapod vertebrate?
Options:
- (A) animals in the class aves
- (B) barks and snarls
- (C) passenger pigeons
- (D) Something that is self-aware
- (E) Generating heat
- (F) retaining heat
- (G) absorb light energy
- (H) it keeps an organism warm
--
Let's think first: Birds are endothermic tetrapod vertebrates. Class Aves is for the birds, literally. Animals in the class aves are endothermic tetrapod vertebrates.... So the answer is [(A)]

What is the result of a dolphin keeping a high metabolism rate?
Options:
- (A) generate blood cells
- (B) generate heat
- (C) overheating
- (D) develop cancer
- (E) kinetic energy
- (F) aerobic capacity
- (G) exercise
- (H) Energy.
--
Let's think first: Mammals generate heat mainly by keeping their metabolic rate high. All dolphins are mammals and all mammals breathe air. Dolphins generate heat by keeping their metabolic rate high.... So the answer is [(B)]