Question

consider the recent phylogenetic tree of five different organisms.

old classification systems based on physical characteristics would most likely disagree with the relationship between which two animals in the tree?

○ crocodiles and insects
○ bats and humans
○ birds and bats
○ humans and crocodiles

Explanation:

To solve this, we analyze the phylogenetic tree and physical characteristics:

1. Crocodiles and Insects: These are very different (vertebrate vs. invertebrate), so old systems would likely agree they're distantly related.
2. Bats and Humans: Both are mammals (share mammalian traits like hair, live birth, etc.), so old systems based on physical traits would likely agree they're related.
3. Birds and Bats: Birds are reptile - like (scales on legs, lay eggs, feathers) and bats are mammals (fur, live birth, wings with skin). Old classification (based on physical traits like feathers vs. fur, egg - laying vs. live birth) would likely disagree with their close relationship shown in the tree.
4. Humans and Crocodiles: Humans are mammals, crocodiles are reptiles, but their physical differences (e.g., scales vs. skin, egg - laying vs. live birth) are more obvious, and old systems might not see a close relationship, but the tree shows a closer link than birds - bats? No, the key is the mismatch in physical traits for birds and bats.

Answer:

The correct option is: birds and bats