1) 🐣 Embryonic Similarities

Definition:
Traits that different animals share when they are just starting to grow in the womb or egg. For example, human, fish, and bird embryos all have tiny tails and gill-like structures early on, showing they may have evolved from a common ancestor.

2) 🌳 Common Ancestor

Definition:
An ancient species that two or more living things came from long ago. For example, humans and whales both came from a common ancestor that lived millions of years ago, which is why they share some of the same bones.

3) 🔬 Homologous Structures

Definition:
Body parts in different animals that look similar on the inside, even if they do different things. For example, a human arm, a bat wing, and a whale flipper all have the same bone pattern, which means they probably came from the same ancestor.

Turn n' Talk Numero Uno:

Compare and contrast the 3d printed arm bones from different species. 

What do the similarities and differences in these structures tell you about how the animals are related? 

Turn and Talk: 

Imagine you are having dinner with the fam, and they ask, "What did you learn today in Biology?". 

1) Scientists study bones, body parts, and early development to learn how species are related and how they’ve changed. 

2) In early stages of development, the embryos of animals like humans, birds, and fish can look very alike. That shows they may have come from the same common ancestor.

3) Body parts that different animals have in common—even if they use them differently—can be signs they came from a common ancestor.