1. 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

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

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

4. 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 ______

5. 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 ____________

6. 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 ________