How does a shark lay its eggs?

Sharks don't lay eggs in the traditional sense like birds or reptiles. There are actually two main ways sharks reproduce:

1. Oviparity (Egg-laying)

* The process: Oviparous sharks lay eggs encased in a tough, leathery case called a "mermaid's purse". These purses are often anchored to seaweed or rocks on the seabed, protecting the developing embryos inside.

* Species: Some examples of oviparous sharks include:

* Dogfish sharks

* Horn sharks

* Nurse sharks

* Whale sharks (despite their size, they lay eggs)

2. Viviparity (Live birth)

* The process: Viviparous sharks give birth to live young. They have a placenta-like structure that allows for nutrient exchange between the mother and developing embryos.

* Species: Most shark species are viviparous, including:

* Great white sharks

* Hammerhead sharks

* Tiger sharks

* Blue sharks

Key Differences:

* Oviparous: Eggs are laid and develop outside the mother's body.

* Viviparous: Young develop inside the mother's body and are born live.

It's important to note: Some shark species exhibit a "modified" form of viviparity called ovoviviparity. In this case, the young develop within the mother's body, but they are nourished by the yolk sac of the egg, not a placenta.

Overall, the reproductive strategies of sharks are diverse and fascinating, reflecting their evolutionary success and adaptability.