Fossils are the remains of organisms from the distant past embedded and preserved in the earth's crust. Fossils may be any sort of organism, from a single-celled bacteria to a tree leaf to a dinosaur, and may be anywhere from ten thousand to several billion years old. They usually consist of parts of the organism which were mineralized during the organism's lifetime, such as bones and exoskeletons.
Apologists claim there there are missing transitional fossils between known species which allegedly disproves evolution. However, the existence of some "gaps" in the fossil record would be expected based on the changing distribution of species and the rarity of fossilization.
The probability of a particular plant or animal being fossilized is exceedingly low. Also, some life forms only exist in particular habitats which do not allow fossilization. Therefore, we would expect a very incomplete fossil record.
- "Question: If, after almost two centuries of digging beneath all the world’s continents, no previous ancestor of this first hard-bodied creature has been found, how then did the ubiquitous trilobite evolve? There should be some previous ancestor if evolution were true."
The answer is obvious: hard bodied creatures are sometimes fossilized but soft body creatures (including the ancestors of the trilobite) were very rarely or never preserved.