Dolphins and Whales
We can demonstrate one such transition problem by using the example of dolphins and whales. These mammals bear their young alive and breathe air, yet spend their entire lifetime in the sea. Presumably, in order for dolphins and whales to have evolved, they must have originated from a land mammal that returned to the water and changed into a sea creature. But dolphins and whales have so many remarkable features upon which their survival depends that they couldn't have evolved! It would be a lot like trying to change a bus into a submarine one part at a time, all the while it is traveling at 60 miles per hour.
The following is a list of transitions evolutionists have to account for in the dolphin in its evolution from some unknown land dwelling pre-dolphin:
× The nose would have to move to the back of the head.
× Feet, claws, or tail would be exchanged for fins and flippers.
× It would have to develop a torpedo shaped body for efficient swimming in the water.
× It would have to be able to drink sea water and desalinize it.
× It's entire bone structure and metabolism would have to be rearranged.
× It would need to develop a sophisticated sonar system to search for food.
Could the dolphin acquire these features gradually one at a time over a period of millions of years? What about the transitional stages? Would they have survived with just some of these features? Why is there a total absence of transitional forms fossilized?
Consider the whale and its enormous size in comparison with the plankton it feeds upon. The whale is a nautical vacuum cleaner, with a baleen filter. While it was "developing" this feature, what did it feed upon before? For me, it takes a great stretch of the imagination to picture the evolution of dolphins and whales.