15.1 The puzzle of life’s diversity
1. Evolution is the process by which_____________organisms have descended from ancient organisms.
2. In 1831, Darwin set sail from England aboard the H.M.S. ______________for a voyage around the world.
3. During his travels, Darwin made numerous __________________ and collected evidence that led
propose a _____________________ about the way life changes over time.
him to
4. Darwin collected the preserved remains of ancient organisms, called _______________.
5. He observed many plants and animals were ___________________to the environments they inhabited.
6. Darwin observed that the_____________________of many animals and plants varied noticeably among
the different islands of the Galápagos. Give an example : ______________________________
15.2 Ideas That Shaped Darwin’s Thinking
1. ______________ and _________ helped scientists recognize that Earth is many ________________ of
years old, and the processes that changed Earth in the past are the _______ processes that operate in the
present.
2. The processes that shaped the Earth millions of years earlier ______________ in the present.
3. If the Earth could change over time, __________ might change as well.
4. Lamarck thought that use or disuse of an organ led to a change in that organ (body part) that could be
passed on to off spring. Examples : Giraffe and Fiddler crab This is _________________!!!!!!!!!!!!!!!!!
5. _______________ reasoned that if the human population continued to grow unchecked, sooner or later
there would be insufficient living __________ and___________for everyone. (carrying capacity*)
15.3 Darwin presents his case
1. In 1859, Darwin published his book, On the Origin of Species. He proposed a___________________ for
evolution called natural selection.
2. artificial selection means the same thing as __________________________________
3. The ability of an individual to survive and reproduce in its specific environment is ________________.
4.An ________________ is any inherited characteristic that increases an organism's chance of survival.
5. Darwin argued that living things have been evolving on Earth for millions of years. Evidence for this process
include: the fossil record, geographical distribution, homologous structures, similarities in early
development, or embryology.
Summary: