The majority of fish reproduce by spawning, a process in which the female and male fish release eggs and sperm simultaneously in a protected environment with or without a complex courting ritual. Some spawners build nests to guard the fertilized eggs.Know More
Apart from building a nest, some spawners carry their embryos and their young around with them, while some, like the substrate spawners, scatter the eggs in the environment and do not guard the eggs or their young after spawning.
Live-bearing fish, which make up about 1 percent of all known fish species, mate to reproduce. The male inseminates the female through a modified fin called a gonopodium. The female livebearer stores the male's sperm and produces several broods of young fry, or newborn fish, from this single insemination.Learn more about Biology
Behavioral adaptation is the process by which an organism or a species changes its pattern of action to better suit its environment. It is contrasted with structural adaptation, which is the appearance of physical features that confer an advantage upon a species.Full Answer >
Carbon film fossils are formed through a process known as carbonization; this process preserves a living thing, typically a leaf, feather, crustacean or fish, as a thin layer of carbon. These fossils are typically made through compression and are generally flat, with a thin layer of carbon showing the fossil's outline (hence the name carbon film).Full Answer >
Goldfish mate by spawning. The female releases her eggs into the water, and the male releases his sperm to fertilize the eggs. Goldfish reach sexual maturity at approximately 1 year of age.Full Answer >
Kangaroos mate by the male inserting its penis into the female's vaginal canals and ejaculating sperm. Kangaroos have two reproductive tracts, which lead into two separate wombs. The two vaginas are partially fused at the base, and both accept sperm during mating.Full Answer >