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Name _________________________________ 16.2 – 16.3 Natural Selection Foundations Period ____ 1 Date ____________ Seat ______ 2 3 4 5 6 7 8 9 10 11 15 12 13 14 16 17 18 19 20 21 24 25 EclipseCrossword.com 22 23 16.2 – 16.3 Natural Selection Foundations Across 1. 5. 6. 7. 8. 9. 17. 20. 21. 24. 25. The selective breeding of plants and animals to promote desirable traits in offspring. (Two words) (387) According to the theory of evolution, all organisms share a single, common __. (391) Introduced by James Hutton, it is the idea that Earth's history is so long that it is difficult to imagine. (Two words) (384) A scientists who independently came up with the same theory as Darwin (natural selection) at about the same time. (Last Name)(388) He proposed that all organisms are born with a desire to become better and could change their bodies so that they worked better in their environment. (Last Name) (385) In natural selection, the __ determines which individuals survive and reproduce. (389) Lamarck's idea that traits could change during the life of an organism. An example is that a bird's legs could become longer by stretching each day. (Two words) (385) How well an organism can survive and reproduce in its environment. (388 - 389) The struggle for __ is a phrase Darwin used to describe the fact that members of a population must compete for food, water, and living space. Those that do not get enough will not survive to reproduce. (388) The name of Darwin's book published in 1858. (5 words) (388) The idea how organisms share ancient ancestors. (Two words) (391) Down 1. 2. 3. 4. 10. 11. 12. 13. 14. 15. 16. 18. 19. 22. 23. A heritable trait that increases an organism's ability to survive and reproduce in an environment. (388-389) A geologist in Darwin's time that concluded that geological processes in the past worked like the geological processes of today. (Last Name) (385) In Darwin's time, many people believed that Earth was only a few __ years old. (384) The process by which organisms that are most suited to their environment survive and reproduce most successfully; also called survival of the fittest. (Two words) (389) After working out his theory on natural selection, Darwin spent another __ years gathering more information and evidence before sharing his ideas with the public. (388) Lamarck thought that acquired traits could be passed on to offspring. For example, over a few generations, the neck of a giraffe would get longer and longer. He called this idea the __ of acquired traits. (385) Every organism alive today descended from parents that were well __ to their environment and thus able to survive and reproduce. (391) Darwin had no idea how heredity worked, but he did know that __ occurs in wild species as well as farm species. (388) A geologist in Darwin's time that described how geological processes shaped the land to make mountains, canyons, rivers, and plains. He suggested that these formations took millions of years to make. (Last Name) (384) An English economist in Darwin's time who thought that human overcrowding led to conditions that would slow population growth. These conditions included war, disease, and starvation. (Last Name) (386) The science that deals with the earth's physical structure and substance, its history, and the processes that act on it. (384) In artificial selection, the __ selects which individuals reproduce. (389) Darwin called the process by which older species evolved into new species over thousands or millions of years, "descent with __." (391) Today scientists know that most of Lamarck's ideas were wrong. Animals do not have a desire to become better. Evolution is not a process that makes animals more "__" over time. (385) Darwin read Malthus' ideas about the dire consequences of human over-population and saw that they were __ for all organisms. (386)