A. The population continues to grow
All cetaceans exhibit similar surface behaviour like breaching,spy hopping,spouting etc..they are huge mammals who live in marine water.they live as a family
More advanced than tools used on earth
This depends on the point of view, I believe. Chelicerate is not the direct ancestor of trilobites, but it is related but distantly.
D. A mole digging tunnels in the ground
