Station 1: Fossil Evidence 1. In what ways have modern horses changed from their previous ancestors? Record at least $$ { }^{3} $$ qualitative observations. The moden horses got bigo li Atso got longen tails. Lastly the mol.e leeth got bigge. 2. How did Tiktaalik provide evidence that amphibians evolved from fish? $$ \qquad $$ Use Mod D pg. 52 or the provided station images to help answer the below questions. 1. What are homologous structures? 2. What are some of the similar features that animals such as humans, bats, dogs, and whales all have in common? Station 2: Evolution Article Read: With a partner, chose 1 evolution article to read Directions: Decide on at least 2 pieces of evolution information that people should know obout this article. Write your information, at least 2 separate pieces of information, in your own words in the provided section. Article Title: To hustocl of human height The articcle'states that Sharter freple live longer. Notronly that if phere is food shert wo ore have better chaces to five because you dorit nacu os moch astaller People. Station 4: Embryology 1. Think back to envelope 2. Which organisms were easier to identify in that envelope? 2. Based on yodr answer above, why were the organisms in envelope 2 easier to identify quickly? 3. Use Mod D pg. 53 and the information from the station to help answer the following question. When looking at early embryo development, what does this say about the evolutionary relationship of all these animals?

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### Station 1: Fossil Evidence

1. **In what ways have modern horses changed from their previous ancestors? Record at least 3 qualitative observations.**
   - **Observation 1:** Modern horses are generally larger in size compared to their ancestors, which were smaller and more pony-like.
   - **Observation 2:** Modern horses have longer tails, which help in balance and fly swatting, unlike their ancestors who had shorter tails.
   - **Observation 3:** The molar teeth of modern horses are larger and more complex, adapted for grinding tough grasses, whereas their ancestors had simpler teeth suited for a different diet.

2. **How did Tiktaalik provide evidence that amphibians evolved from fish?**
   - Tiktaalik is a transitional fossil that exhibits both fish-like and amphibian-like characteristics. It has features such as fins with bone structures similar to the limbs of tetrapods, which suggest it was capable of moving onto land. This indicates a significant evolutionary step from aquatic to terrestrial life, supporting the idea that amphibians evolved from fish.

3. **What are homologous structures?**
   - Homologous structures are anatomical features in different species that share a common ancestry, even though they may serve different functions. For example, the forelimbs of humans, bats, dogs, and whales have similar bone structures but are adapted for different purposes like grasping, flying, running, and swimming.

4. **What are some of the similar features that animals such as humans, bats, dogs, and whales all have in common?**
   - All these animals possess a similar skeletal structure in their forelimbs, including the presence of humerus, radius, and ulna bones. Additionally, they all have a similar arrangement of bones in their limbs, indicating a common evolutionary origin.

### Station 2: Evolution Article

**Article Title:** To Hustocl of Human Height
1. **Information Piece 1:** The article states that shorter people tend to live longer than taller people, suggesting a potential link between height and longevity.
2. **Information Piece 2:** It also mentions that when food is scarce, shorter individuals have a better chance of survival because they require less food to sustain themselves compared to taller individuals.

### Station 4: Embryology

1. **Which organisms were easier to identify in that envelope?**
   - The organisms that were easier to identify in envelope 2 were likely those with more distinct and recognizable features, such as vertebrates with clear limb structures or recognizable body shapes.

2. **Why were the organisms in envelope 2 easier to identify quickly?**
   - The organisms in envelope 2 were easier to identify because they had more pronounced physical characteristics that are familiar to us, such as limbs, heads, and tails, making them stand out compared to more ambiguous or less developed organisms.

3. **When looking at early embryo development, what does this say about the evolutionary relationship of all these animals?**
   - The similarities observed in early embryo development among various animals suggest that they share a common evolutionary ancestor. This indicates that despite the differences in adult forms, the underlying genetic and developmental processes are conserved across species, highlighting the interconnectedness of life on Earth.

These answers provide a comprehensive overview of the questions posed in each station, reflecting an understanding of evolutionary concepts and evidence.
- **Station 1: Fossil Evidence** - **Modern Horses:** - Larger size - Longer tails - Bigger, more complex molars - **Tiktaalik:** - Transitional fossil showing fish-like and amphibian-like features, indicating amphibians evolved from fish. - **Homologous Structures:** - Similar bone structures in forelimbs of humans, bats, dogs, and whales. - **Similar Features:** - Common skeletal structure in forelimbs across these animals. - **Station 2: Evolution Article** - **Key Points:** - Shorter people tend to live longer. - Shorter individuals have better survival chances in food-scarce environments. - **Station 4: Embryology** - **Identified Organisms:** - Easier to identify in envelope 2 due to more distinct features. - **Reasoning:** - Clear physical characteristics made them easier to recognize. - **Evolutionary Relationship:** - Similar early embryo development shows shared ancestry among different animals.

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