All animals and plants change gradually, so
anything not yet discovered in the ocean would be
different from what it was like when dinosaurs
were still alive. Did you know birds and
dinosaurs are relatives?
Also, we haven't discovered everything
yet; but we're mostly discovering tiny animals
like insects, not large ones.
How long do sea creatures live? Whales
are the longest lived [and largest] mammals - they
can live over 200 yrs. The longest lived of
all animals is a type of clam in the North
Atlantic ocean that can live 500 yrs!
read more here
1. Here's a good description of why people think
they find something scary in the ocean:
Why do people see sea monsters?
The open ocean can be a terrifying place. Miles
from shore on storm-tossed seas, with nothing but
water in all directions--including straight
down--a sailor or fisherman cannot help but wonder
what lurks in the depths. When the oceans were
still unexplored, these fears often took the form
of imaginary monsters.
2. The whole article is really useful, and it's
from a museum that knows a lot about science:
Sea Monsters - American Museum of Natural
Many sea monsters include features from living
animals. A large tentacle becomes part of a
monstrous sea serpent or many-armed kraken: The
eye sees a ...
3. Some animals that live deep in the ocean
are larger than the ones not so deep in the ocean,
but those are all animals without backbones; so
they aren't dinosaurs. Here's an interesting
article from Wikipedia:
Deep-sea gigantism - Wikipedia
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