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Across 1. An English economist who observed that babies were being born faster than that people were dying; suggested that war, famine and disease limit polulations; Darwin took this idea further and applied it to all organisms (2 Words) 3. Ship that Darwin sailed on during his 5 year voyage around the world (2 Words) 4. The Father of Geology; Darwin agreed with his idea that the modern world must have been shaped by the same geological forces that can be seen today, thus lending to the idea that life could change over time as well. (2 Words) 6. The process by which species struggle for existance, which selects the fittest individuals to survive in nature (2 Words) 9. Structures derived from a common ancestor or same evolutionary or developmental origin which are often used for different purposes in varying species 11. an argument by proponents of intelligent design (Creationists) that certain biological systems are too complex to have evolved from simpler, or "less complete" ancestors (2 Words) 13. Structures which seem to have little or no purpose in the organism; refers to an organ or part which is greatly reduced from the original ancestral form and is no longer functional or is of reduced or altered function 14. Proposed a theory of evolution occurring by the process of natural selection. The animals (or plants) best suited to their environment are more likely to survive and reproduce, passing on the characteristics which helped them survive to their offspring. Gradually, the species changes over time. (2 Words) 15. a change over a period of time 16. Structures of different species having similar or corresponding function but not from the same evolutionary origin or of the same and structural make-up 17. Humans selecting organisms to reproduce offspring (2 Words) 18. the ability of an organism to survive and reproduce, therefore successfully pass along its genes to its offspring.

Down 2. The full title of Darwin's book that was published in 1859 (10 Words) 5. Creationists believe that certain features of living things are best explained by this, and not natural selection (evolution) (2 Words) 7. Where Darwin discovered most of his observations that led to his hypothesis about the history of life on Earth. (2 Words) 8. a combination of behaviors and physical characteristics which help a species survive and reproduce in its environment 10. a group of organisms share this if they have a common ancestor (2 Words) 12. bones and other traces of ancient organisms