请帮忙翻译几个句子汉译英（不要翻译器）谢谢

Sharks existed long before there were dinosaurs.
They are the fiercest animals in the ocean.
Sharks are large creatures with sharp saw-like teeth.
Sharks have soft cartilage throughout their entire body, which provides greater flexibility than skeleton.
Sharks have to continuously swim about, otherwise they'll suffocate.

As early as the dinosaurs had a shark
He is the most ferocious animal in ocean
The shark is very big and look like a sawtooth sharp teeth
The shark has a cartilage, cartilage bones than lighter is elastic
It has to constantly swim or will suffocate

As early as in a dinosaur has already before there's a shark
He is the most fierce animals in the ocean
Shark very large and have like a sawtooth sharp teeth
Sharks have a cartilage, cartilage bones lighter than elastic
The shark to unceasing swimming or you will have suffocated