The goldfish should never be in the same tank as guppies. Goldfish are coldwater fish and need to be kept below 70F. Guppies are tropical fish and need to be kept above 70F.
No. Generally, fish cannot breed across different species. Also, guppies cannot tolerate water temperature changes that goldfish can, so they would not last long in the same tank.
Yes, do not go get another guppy unless it is the same gender they reproduce really fast. But fish are better with another fish.
Chihuahuas reproduce in the same manner as does any other breed of canine. The male and female mate and the female has puppies.
Pelicans reproduce in the same manner as all the other birds, by a male and female bird pairing up and mating.
If the Koi is large enough it may well eat a goldfish fry but Goldfish and Koi are not fighting type fish so they do not normally bite one another.
Variation in guppy coloration developed as a trait due to sexual selection. Female guppies prefer males with brighter and more colorful patterns, leading to the evolution of diverse coloration in males as a way to attract mates. This color variability helps males stand out and successfully reproduce.
That does not happen with guppies. They stay the same sex for life.
The plural of goldfish is goldfish. It is the same as the singular.
The guppy was "Lebistes reticulatus" for many many years but now the taxonomists in their ultimate wisdom, have decided that the guppy should be in the same classification as the Molly. Now the Guppy is correctly called "Poecilia reticulata".
They are the same thing.
No. Goldfish do not inhabit that same environment as killer whales do. Goldfish are not marine animals.