the mean reson why animals become extinct due to natural selection is the never ending stuggle for food, for examlpe lets say a deer was liveing in Africa and the trees was to high. for the deer to get any leaf's (food) the animal would have to go thew phisical and mental change's.(due to a mutacion in the dna) if not the deer would die because their would be no possible way for the animal to get any food.
alligators have no natural enemies but us,but animals that the alligator ate will increase over 77%
The answer is: Darwin
Natural Selection
If an animal becomes extinct, there will be no more of that species left like the Dodo. No more are left as they are extinct.
Mammals .
Many of the animals began to die off and became extinct.
The cryptoclidus became extinct an estimated 65 million years ago. This reptile was one of the biggest marine animals of that time.
The large rodents became extinct due to evolution. This can happen to many different types of animals not just rodents.
it would have to be the time where the meteor hit Earth and dinosaurs became extinct.
It is generally accepted that animals from the prehistoric time became extinct to a massive shift in climate. Scientists believe that a meteor struck the earth and the aftermath caused the extinction of many plants and animals.
bout 2,5603 animals this year mostly bacteria and viruses but also several insects and mammals ,because of pollution ,because of over hunting ,because of alcohol and chloride and antibiotics,by electrical arrangements ,in short all because of history ,technology, and nuclear reactors
Because people kept finding their fossilized bones as well as complete animals frozen in the permafrost of Siberia. There aren't any of those animals living now so they must be extinct.