The period of the history of the earth that is referred to as Chemical Evolution was essential for the appearance of life as we know it. This theory asserts that Chemical Evolution is a) confirmed by laboratory experiments, b)  occurred without the presence of any living organisms, c) created the conditions needed for primitive life, d) occurred because of the properties of elements and the compounds that they formed. e) All are assertions of this theory.

3:10 1 Back Pulse Question 42 (Mandatory) Amphibians evolved directly from which ancestral organisms? a) Small mammals b) Echinoderms (sea urchins) c) Marine invertebrates d) Fishes e) Reptiles Question 43 (Mandatory) Which best explains how Australia has distinctive organisms, such as marsupials, that cannot be found anywhere else on earth? a) Australia experienced a significantly slower rate of evolutionary change. b) Australia was separated and isolated from other land masses for a long period of time. c) There are fewer species of organisms in Australia than most continents. Australia has an unusual climate that has triggered natural selection. e) The predators of marsupials eliminate populations in other locations.

Below are some key events that took place during the long history of life on Earth. Arrange them in the correct sequence:   First land plants (kingdom Plantae) First eukaryotic life (domain Eukarya) Adaptive radiation of mammals (class Mammalia) Evolution of chloroplasts Cambrian explosion First aerobic organisms (those that utilize cellular respiration) First land vertebrates (tetrapods) First multicellular organisms First living cells

Imagine you are the biologist on a space ship whose five-year mission is to seek out new life on other planets. Your job is to find hereditary material. What is the singlemost important characteristic you will use to determine whether the chemicals you discover are good candidates for hereditary material.