Evolution

Is "evolution" a proven fact or a theory? What other ideas compete with evolution to explain changes in populations? What are the differences between these competing ideas?

Evolution questions

Today scientists try to classify cretures on the basis of evolutionary relationships. True or false? Because taxonomy, all scientists always agree on the species of all animals. True or false? If spiders and scorpions belong to the same class, then they must also belong to the same phylum. True or false? Scientist only consider breeding behavior when determining evolutionary relationships. True or False? Scientists believe that all speciation takes place gradually over a very long period of time. True or False? According to the Hardy-Weinberg principle, the frequency of alleles in a population tends to change even when nothing specifically affects them. True or False?

Evolution questions

Which of the following statements do scientists beleive to be true- (A) Life on earth began about 5000 years ago. (B) The largest mass extinction occurred at the end of the twentieth century. (C) 245 million years ago there was only one landmass. (D) Microorganisims are generated by a life force in the air. Which of the following statements do scientists beleive to be true- (A) The first life forms were not composed of organic molecules. (B) The first eukaryotes which ingested smaller prokaryotes. (C) The first cells probably required oxygen to live. The Indian elephant's scientific name is elephas maximus. Elephas is the Indian elephant's- (A) genus (B) species (C) family (... click for more

Australia, bird with three-toed feet

A. At one time the continent of Australia was connected to Asia. About 50 million years ago Australia became separated. It has many unusal animal not found elsewhere, such as the kangaroo and the koala bear. Using the concepts of geographic isolation the gene pool, explain why these animal developed. B.A species of bird with three-toed feet feeds mostly on worms and crwling insects. Over a period of several thousand years, the ocean level rises, and the region where the bird lives is flooded. Over several thousadn years ago or so, the birds' descendants evolve webbed feet and begin to feed on fish. Is this an example of gradualism or punctuated equilibrium? Can you give me an explanation... click for more

Natural selection

1. Who were a three scientist whose work was fundamental to Darwin's theory? How did their thinking influence his? 2.Vestigial Organs and Embryology are types of evidence that support the theory of natural selection. How each support the theory of natural selection?