they both use ecolocation to see and hear
that they share a common ancestor
Bats, dolphins, and some fish.
Bats and Dolphins both use sound to navigate.
dolphins ,bats, and submarines all have echo location
I don't think dolphins and bats talk to each other much. Bats live on land and dolphins live out at sea.
dolphin sleep in ocean and in hear share
yes
"sonar".
Dolphins are warm blooded like other mammals.
Most mammals do not have the ability to use echolocation. The mammals that do are bats and dolphins. They use it to navigate and locate prey even when it is difficult to see (for bats, that is at night and in caves, and for dolphins, it is useful in the water when visibility is reduced.
In general, being an albino has no effect on an animal's ability to mate.
It is an audio form of radar - the ability to tell the size and distance of object by listening to the echoes they produce. Bats use it in the air. Dolphins, porpoises and whales use it under water.