Final answer:
Megalodon sharks had massive jaws with sharp teeth and were ovoviviparous like some modern sharks. They were significantly larger than a school bus, with some estimates suggesting lengths of up to 60 feet. The evolution of jaws was crucial for vertebrates to become large by providing new feeding opportunities.
Step-by-step explanation:
Characteristics of Megalodon Sharks
The Megalodon shark is known for its immense size and powerful jaws, equipped with multiple rows of sharp teeth, similar to those of the modern sharks. These sharks had a massive bite force, capable of crushing shellfish, which is a characteristic of some contemporary bullhead sharks. Additionally, like many shark species, including mackerel sharks, Megalodons were ovoviviparous, meaning that after internal fertilization, the eggs developed inside the mother's body and the young were born alive.
Comparison in Size to a School Bus
Comparing the size of a Megalodon to a school bus, the Megalodon was significantly larger. An average school bus is about 35 feet in length, while estimates of Megalodon's size suggest they could reach lengths of up to 60 feet or more. This makes the Megalodon longer than a school bus, and it has also been estimated to weigh as much as 100,000 pounds, which is considerably heavier than an average bus.
Advantages of Large Size in Animals
Large animals, like Megalodons, typically have several advantages due to their size, such as the ability to capture larger prey and defend themselves against predators. However, smaller animals also have benefits, such as requiring fewer resources and being able to hide or escape more easily.
Evolutionary Significance of Jaws
The evolution of jaws was a key factor in allowing vertebrates, including sharks, to become 'big' by opening up new food sources and methods of predation. Jaws allow vertebrates to grip and process a wide variety of prey, which helped some species to thrive and grow larger.