16.1 Developing a Theory I. ______________ A. The process by which _________ change over ________ B. Theory 1. a broad _____________that has been scientifically _________ & __________ C. Evolutionary theory keeps ____________ & ______________ 1. many scientists have tested and continue to _____ ideas

II. Charles ___________ A. __________ Naturalist, spent ____ years traveling the world on the HMS ________

B. Visited the __________ Islands off coast B. Visited the __________ Islands off coast of Ecuador (________ _________) 1. Collected several different species of birds called __________

2. Each are very_______, but differences 2. Each are very_______, but differences can be seen in their ______ (or beaks) a. Each bill seems suited to each ____ 3. Noticed many of the islands’ ________ & _________ were similar to ____________ a. Darwin believed that _________ organisms descended from ____________ organisms b. Descent With ________________ 1. animals ________ over time by eating different types of ______

C. Breeding & Selection 1. ____________ selection a. the __________ practice of breeding animals or plants that have certain _________ traits 1. ex- ______ breeds III. Darwin’s Ideas from Others A. Jean Baptiste ____________ 1. French scientist that proposed idea of ______ & ________. a. if you don’t use your muscles they ___________ in size and you pass this on to your offspring b. this idea was eventually ____________

B. Thomas ___________ 1. English ______________ 2. stated populations increase faster than ______ supply causing ____________ C. Charles __________ 1. ____________ 2. Thought that earth’s processes were __________ and constantly ____________ 3. Fossils found in layers of Earth show gradual _________ of species over ________