Do you mean a manta, like a ray? Because a mantis is a type of insect.
Ultimately, all creatures are related. Chlorophyll is chemically similar to hemoglobin. Fruit flies use the same genes to differentiate head from tail during egg development as humans do. But in ordinary terms, in the sense that we say dogs are related to wolves and house cats are related to cougars, no, the whale is not related to the mantis--a type of insect--or to the manta ray--a type of shark.
Mantis (i think)
Assuming you meant a preying mantis - it's an insect ! See related link to Wikipedia for a picture of a typical example.
No
The shark is a fish and the whale is a mammal. They are not related in any way, so they have no relations in common.
I think the shark is related to the whale and dolphin, it kind of seems like a mix of them both.
cars
Yes it is. See the related link for a picture of a typical specimen.
No whale are mammals.
They are actually more related to dolphins than whales.
Yes, even though a tiger is of a the cat family, it is more closely related to a dog than that of a whale and a fish because a whale is a mammal but a fish is not.
NO! Beluga whales are related to the dolphin family and they can stay in zoos.
No. Whale has a long A and shine has a long I. (see related question)