What is part of an animal's excretory system?
Options:
- (A) alveoli
- (B) garbage chute
- (C) pollen
- (D) glucose
- (E) bloodstream
- (F) kidneys
- (G) food
- (H) intake
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Let's think first: Organs of excretion make up the excretory system. Leptospiral organisms cause infection in the kidneys and are excreted in urine. Kidneys are part of the excretory system.... So the answer is [(F)]


_ are tetrapods.
Options:
- (A) animals
- (B) amoeba
- (C) Frogs
- (D) Length
- (E) insects
- (F) Spiders
- (G) Snakes
- (H) Birds
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Let's think first: Amphibians are the first true tetrapods, or vertebrates with four limbs. Frogs are classified as amphibians. Frogs are tetrapods.... So the answer is [(C)]


What kind of species are seahorses?
Options:
- (A) horse
- (B) seaweed
- (C) edible
- (D) marine
- (E) a fish
- (F) shellfish
- (G) strong
- (H) food
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Let's think first: Marine species live mainly in shallow coastal waters. Seahorses inhabit shallow coastal waters, especially seagrass beds, coral reefs and mangrove swamps. Seahorses are marine species.... So the answer is [(D)]


What keeps mammals warm?
Options:
- (A) evaporation
- (B) Animal fur
- (C) staying warm
- (D) sweating
- (E) They have thick fur
- (F) with their fur
- (G) a layer of fat
- (H) Veins and arteries.
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Let's think first: Mammals have a layer of fat under the skin to help insulate the body. Glass insulation keeps beverage warm for hours. Mammals have a layer of fat under the skin to keep them warm.... So the answer is [(G)]


Bacteria causes what to be harmed?
Options:
- (A) plants
- (B) electronics
- (C) fossils
- (D) humans
- (E) animals
- (F) viruses
- (G) food
- (H) the skin
--
Let's think first: Plants respond to daily and seasonal cycles and to disease. Plant diseases cause by bacteria. Plants respond to seasonal and daily cycles and to bacteria.... So the answer is [(A)]


Amphibians have what sort of sensing system?
Options:
- (A) strong
- (B) retina
- (C) four limbs
- (D) chemical
- (E) mechanical
- (F) the eyes
- (G) nerves
- (H) heat or cold
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think first: Amphibians have sense organs to smell and taste chemicals. Smell and taste belong to our chemical sensing system. Amphibians have a chemical sensing system.... So the answer is [(D)]