Cartilaginous Fish

skates

rays

dolphins

sharks

cartilage

spiracles

rays

rigid fins

jelly fish

lancletes

cartilaginous fish

bony fish

cartilage

spiracles

placoid scales

rigid fins

cartilage

spiracles

placoid scales

rigid fins

100 million years

500 million years

300 million years

800 million years

Blue whale.

Megalodon

Tiger shark

Beluga whale

was linked to the size of its offspring

was linked to the size of its ancestors

was linked to the size of its teeth

was linked to the size of its prey.

Its food started to disappear, and has competition with Great White Sharks

It couldn't handle the colder waters of its prey

It became infertile due to changing oxygen levels

it had a larger predator.

Goblin

Mako

Piper

Greenland

1/3 of its body weight

2/3 of its body weight

sharks do not have a liver

none of the above

spiracle holes

dorsal fin

lateral line organs

acute sense of smell

lateral line organs

caudal fin

spircales

claspers

They eat their siblings.

They stay close to conserve heat.

They develop human like characteristics.

They attempt Amullae of Lorenzini