There are many similarities and differences between a shark and a whale. The similarities is that have a similar streamlined body structure but the differences are many including sharks are fish while whales are mammals, sharks have a vertical tail structure while whales have a horizontal one among others.
Sharks are Sharks and dinosaurs are dinosaurs. But there were animals recognizable as Sharks living when the dinosaurs did.
both fish
analogous
Honey, sharks and dinosaurs didn't exactly hang out at the local diner together. Sharks have been around for about 450 million years, while dinosaurs roamed the Earth around 230 million years ago. So, unless a shark has a time machine hidden in its fin, it's safe to say they never crossed paths for a meal.
their race and their opportunities
Similarities: Both dolphins and sharks are marine animals that belong to the class of fish. They both have streamlined bodies, fins for swimming, and are carnivorous. Differences: Dolphins are mammals, while sharks are fish. Dolphins give birth to live young and nurse them with milk, while sharks lay eggs or give birth to live young. Dolphins are known for their intelligence and social behavior, while sharks are more solitary animals known for their hunting prowess.
Dolphins breathe with lungs while sharks breathe with gills.
Sharks existed at the same time dinosaurs did. Sharks pre-date the dinosaurs by quite a bit. To get from sharks to dinosaurs: sharks - bony fish - lobe finned fish - lung fish - amphibians - reptiles - dinosaurs.
Shark
There are many differences between the shark and the dolphin. Sharks are cartilaginous fish whereas the dolphin is a mammal. Sharks take air in through their gills while dolphins breathe fresh air using their lungs.
Dinosaurs likely had a cloaca, which is a single opening for waste elimination, reproduction, and urination. This is based on the similarities between dinosaurs and modern birds, which are known to have cloacas.