This science artilce investigates convergent evolution in different organisms and how two totally unrelated species can evolve to resemble each other in different ways. We investigate convergent evolution in color, body shape, body organs, defensive spines, tongues, eyes, animal behavior, brain function, mimicry and in extinct species. We also look at convergent evolution in animals, plants, fish, insects and reptiles.
Reasons for the evolution of eyesight during the period known as the Cambrian explosion; how the evolution of eyesight resulted in organisms becoming either prey or predators. An explanation of how eyesight evolved through eight simple steps; recessed light sensitive cells, the pin hole eye including a description of the eye of the nautilus mollusc; the spherical lens with greater refractive powers.
We look at ‘evolution by artificial selection’; we investigate how human activity has shaped and sculptured the physical appearance of certain organisms; the evolution through artificial means of fancy pigeons, cows, dogs, wild cabbage and (perhaps!) a certain crab; an introduction to Charles Darwin and the contents of the first chapter of his book,’Origin of the Species through Natural Selection’.
An introduction to ‘evolution by natural selection’; examples of organisms that are equipped to survive in their natural habitats; animals that have evolved over time; how a peacock’s impressive plumage has evolved to help them reproduce; a brief explanation of how organisms are programmed to behave in certain ways; the role of DNA in natural selection; a definiton of ‘evolution by natural selection’