In the phylogeny to the right, draw a box around the clade Sarcopterygii (lobe-finned fishes). Label it “A”. b. Draw a box around the sister group to Echinodermata. Label it “B”. c. Circle the node that corresponds to the most recent common ancestor of Actinopterygii and Chodrichthyes. Label it “C.”

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In the phylogeny to the right, draw a box around the clade Sarcopterygii (lobe-finned fishes). Label it “A”. b. Draw a box around the sister group to Echinodermata. Label it “B”. c. Circle the node that corresponds to the most recent common ancestor of Actinopterygii and Chodrichthyes. Label it “C.”
This image is a cladogram, a diagram used to depict the evolutionary relationships among different groups of organisms, representing a hypothetical sequence of divergence in the evolutionary history. The branches indicate common ancestry and descending/speciation events.

**Explanation of the Cladogram:**

1. **Root Line**: Represents the common ancestor of all the groups shown in the cladogram.

2. **Branches**:
   - **Echinodermata**: The first branch, indicating divergence from the common ancestor.
   - **Urochordates (sea squirts)**: Branching off next, representing an early divergence among chordates.
   - **"Agnatha"**: Includes jawless fish, branching off before the evolution of jawed vertebrates.
   - **Chondrichthyes**: This line leads to cartilaginous fishes like sharks and rays.
   - **Placodermii**: An extinct group of armored prehistoric fish, shown diverging at the same level as Chondrichthyes.

3. **Vertebrates Branch**:
   - **Actinopterygii**: Ray-finned fishes, which split off next.
   - **Sarcopterygii**: This line leads to two branches:
     - **Dipnoi (lungfishes)**: Lungfishes, representing one branch of lobe-finned fishes.
     - **Tetrapoda**: Includes all four-limbed animals, indicating a closer evolutionary relationship with Dipnoi than with other groups on the tree.

Each split on the diagram represents a point where evolutionary paths diverged, showcasing the complexity and common ancestry of these diverse groups.
Transcribed Image Text:This image is a cladogram, a diagram used to depict the evolutionary relationships among different groups of organisms, representing a hypothetical sequence of divergence in the evolutionary history. The branches indicate common ancestry and descending/speciation events. **Explanation of the Cladogram:** 1. **Root Line**: Represents the common ancestor of all the groups shown in the cladogram. 2. **Branches**: - **Echinodermata**: The first branch, indicating divergence from the common ancestor. - **Urochordates (sea squirts)**: Branching off next, representing an early divergence among chordates. - **"Agnatha"**: Includes jawless fish, branching off before the evolution of jawed vertebrates. - **Chondrichthyes**: This line leads to cartilaginous fishes like sharks and rays. - **Placodermii**: An extinct group of armored prehistoric fish, shown diverging at the same level as Chondrichthyes. 3. **Vertebrates Branch**: - **Actinopterygii**: Ray-finned fishes, which split off next. - **Sarcopterygii**: This line leads to two branches: - **Dipnoi (lungfishes)**: Lungfishes, representing one branch of lobe-finned fishes. - **Tetrapoda**: Includes all four-limbed animals, indicating a closer evolutionary relationship with Dipnoi than with other groups on the tree. Each split on the diagram represents a point where evolutionary paths diverged, showcasing the complexity and common ancestry of these diverse groups.
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Phylogeny

It relates to the history of an organism's evolution, particularly when it comes to lines of descent and interactions between large groups of individuals.

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