Also used to describe the process of genetic change within a population, as influenced by natural selection.adaptive landscape: A graph of the average fitness of a population in relation to the frequencies of genotypes in it.Terry Harrison of New York University, leading to the recovery of more than a dozen new hominin finds, Dated to 3.7 million years ago, they were the oldest known evidence of hominin bipedalism at that time.
Based on analysis of the footfall impressions "The Laetoli Footprints" provided convincing evidence for the theory of bipedalism in Pliocene hominins and received significant recognition by scientists and the public.
Even if the bone or shell dissolves, the mineral deposits in the shape of the body structure remain.
Besides rock, fossils may be found as the result of an organism being entombed in ice, tar (like the famous La Brea Tar Pits in Los Angeles), or amber, in which ancient insects have been found, wonderfully preserved.
The study of how life evolved would be impossible if not for the history that is told in the fossilized remains going back billions of years.
Scientists have described about 250,000 different fossil species, yet that is a small fraction of those that lived in the past.