Animals with bad design.

But wait - how long do you think a world like that would last? If every plant and animals is perfectly equipped to fend off every potential snack seeker - nothing would get eaten, nutrients wouldn't be exchanged, the complex circle of life would come to a grinding halt.

First of all I am not the one who stated that 99.9% of species are extinct, science did. I am not the one who also stated that species change by descent with modification, science did.What I am saying is that these two statements contradict each other when science is defining how life changed from the past and at the same time stating that 99.9% are extinct which means nothing can descend from them.

I imagine the original cat to have been an incredible creature, with its multi-coloured fur, stripes, spots and sabre-teeth. Subsequent deleterious mutations would have resulted in the diverse feline kingdom we have today; the loss of retractable claws resulted in the cheetah, for example.

A cat, through a random mutation, gains extra muscles in its leg. All other members of the population die out. Why?The cat mutates tendons attached to the muscles. All other members of the population die out. Why?The cat mutates tendon sheaths to protect the tendons. Without them, the friction between bare tendon and muscle would create irritation, infection and death. Kind of hard to understand how the previous generations survived, but hey. All non-mutants (hardly surprisingly) die out.The cat finally mutates sharp claws. Well done. We now have a genuine, believable, survival advantage. What a shame that the first three stages defy all logic.