1. Do Now – Copy the question and just write the letter for your answer
Which of the following best explains how the fossil record provides evidence that evolution has occurred?
A. It indicates that forms of life existed on Earth at least 3.5 billion years ago.
B. It indicates the exact cause of structural and behavioral adaptations of organisms.
C. It shows how embryos of many different vertebrate species are very similar.
D. It shows that the form and structure of groups of organisms have changed over time.
Answer is D

2. What do Developmental biologist do?

3. What do Developmental biologist do?
study living organisms from embryos to mature adult and beyond. Pg. 45

4. *Embryos
Are organisms before they are born or hatched.

5. Comparative embryology
Determine which 3 embryos belong to the following vertebrates( organisms with a back bone) a fish, chicken, human, calf, and a frog.
Remember each organism has 3 embryos.
Start with late stage, middle stage, and early stage.

6. Correct Order

8. More embryos
uess-embryo.html

9. 3D Ultra Sound of aChimp

10. Copy the answer!
Similar structures are present in the embryos of fish, chickens, and rabbits. In fish, these structures develop into gills, but in chickens and rabbits, they either disappear or develop into other body parts later in embryonic development. Which of the statements below best explains the presence of these structures in the embryos of all three species?
a. The embryos of the three species are similar in size.
b. Breathing structures are similar among the young of the three species.
c. The three species have common ancestor with these embryonic structures.
d. The reproductive mechanisms are similar among the adults of the three species.
The answer is C

11. Questions for Modern Life: Evidence for Evolutionary Change (pg
1. Species change gradually over time. Briefly summarize the bird study from the essay that supports this claim.
2. What environmental change caused the biological change in the two bird species from the study?
3. What is a homology? Provide an example.
4. What is a vestigial structure?
5. Describe one of the vestigial structures in figure E2.6. (pg. 109). Why is this structure vestigial?
6. True or False: All living things, including bacteria, have the same bases for DNA (A, T, C, G).
7. Look at figure E2.7. Which animal is the least similar to a human? How do you know this?
8. What are 4 pieces of evidence that support the theory of evolution? (These are given throughout the reading)

12. 1) In general, which organisms have embryonic stages that are the most similar in late development? The least similar? Explain your answers.
2) What do you think these similarities and differences tell scientists about how these organisms have changed across time and how they are related?

13. Analysis Questions
Page 46
Question D (1-2)