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B. Devonian
C. Cambrian
D. Carboniferous
The correct answer is option B. Devonian.
The amphibians are the tetrapods (having four limbs), which can live in both water and land, but for reproduction purpose, they need water and early life is exclusively aquatic. The amphibians are known to be evolved from lobbed finned fishes around 370 million years ago in the Devonian period of the Paleozoic Era.
OA. A whale is a mammal that does not live on land.
B. A fish is not a mammal and does not live on land.
OC. A horse is a mammal that lives on land.
D. A snake is not a mammal but lives on land.
Whales are marine mammals that do not live on land, disproving the conjecture that all mammals live on land.
The correct counterexample that shows the conjecture “All mammals live on land” is false is option A. A whale is a mammal that does not live on land. Whales are marine mammals and live in water their entire lives. This counterexample disproves the conjecture that all mammals live on land.
Answer:
The bartender of the Private Club
Explanation:
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b. secrete hormones directly into the bloodstream.
c. are instrumental in producing myelin, which protects the neurons.
d. secrete neurotransmitters into the brain.
Answer:
B.secrete hormones directly into the bloodstream
Archaea?
Explanation:
Domain archaea holds micro-organisms that is bacteria that has cell wall consist up of peptidoglycan .The eukarya differ from the archea and bacteria in that cells are eukaryotic,meaning they consist up of a membrane enclosed nucleus and other membrane enclosed organelle