>>94400161>>94402302>>94400371>>94406850(Damn this is a longer lecture than I thought I'd post)
Fish and Amphibians are even more different in that they typically perform external fertilization. These eggs, like bird and reptile, form a shell around them (soft-shelled though, since being in water removes the necessity to store water in the egg like land laying eggs) partially in the female and then spit out. These eggs however are only gametes and still require fertilization, which is provided by the male basically hovering over the pile of eggs and then ejaculating over the whole pile. These then develop similar to other eggs, forming a zygote, blastula, fetus, until the baby breaks its way out of the shell. Because someone will probably bring this up, some species will external fertilize and then incubate internally, like seahorses and some sharks.
Of course, these are also the standard, and don't account for the inevitable exceptions.
TL;DR So, to answer your question. Land species typically perform the sex then lay or internally incubate; water dwelling deposit gametes externally, then fertilize and let them incubate there.
And of course, all this high school biology knowledge goes out the window when we are talking about whatever the fuck Vengess are. When Wrathia is a lava-skin sun alien thing, Perdi has 3 eyes and a more human looking skin and hair, and their egg looks like cracked lava rock; who knows. Best I could theorize is that, as land dwelling species, they did the deed, she laid the egg (which probably is hard-shelled, like lava rock or some shit,) and it has a 20 year incubation cycle.
And now you know.
