My guess would be that they would be classified as mammals, given their humanoid appearance.
There is no such thing. Mammals are one classification, and birds are another. All birds lay eggs. The platypus and the echidna are the only egg-laying mammals.
No, sperm cannot fertilize fish eggs to create a mermaid. Mermaids are mythical creatures and not a product of human and fish reproduction.
If this compound is refined can be classified as a pure substance.
A flea is a parasite that feeds on the blood of its host, usually mammals or birds. In a food chain, fleas would be classified as secondary consumers, feeding on the blood of primary consumers (such as rodents) that in turn feed on producers (plants or algae). In a food web, fleas would be part of the interaction between various species of mammals or birds and their respective predators.
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If mermaids existed (which they don't) they would presumably be mammals. At least, most depictions of mermaids show them with obvious mammalian characteristics (specifically, obvious human characteristics; most mammals do not have large, permanent breasts).
If mermaids existed a common depiction shows them with hair and with breasts so they are mammals which, by default, would make them animals as well since mammals are animals.
If mermaids existed they would poop in the same way that fish do.
If they existed, mermaids predators would be fishermen, sharks, whaling ships, and oil spills.
no because mermaids and merman are not real If they existed they would of course talk because their torso is human.
No. Mermaids could never have existed. Something that is half human and half fish would be a contradiction of biology.
Dolphins are classified as mammals.
Most artwork depicting mermaids show them to have breasts. This would lead to the conclusion that without a doubt mermaids are mammals and therefore nurse their offspring. Generally it seems that they are modest about showing their breasts and wear a brassier of sorts made of seashells. While I would think that this would be very uncomfortable, this does appear to be their common practice. So just as dolphins and humans are mammals and the females of these species produce milk for their young, mermaids would do the same for their children.
No mermaids are not real and have never existed. People can not be mermaids because it is impossible for humans to change shape or become something else ( think how messy that would be). It is all make believe.
If mermaids existed, they would eat any type of fish that they could catch. They'd also probably eat other types of seafood like clams or shrimp or squid.
Mermaids are mythical creatures that are half-human and half fish. They do not exist in real life, therefore they do not talk. In books and films, however, mermaids usually are able to speak. They also often sing beautifully.
If they existed, they probably would be. Horses tend to be mammals.