Animal Classification Worksheet Solution showing the classification of animals into vertebrates and invertebrates with examples.

Problem Analysis:

The task involves classifying animals based on whether they have a backbone (vertebrates) or do not have a backbone (invertebrates). The diagram provided in the worksheet is a flowchart that categorizes animals into these two main groups and further subdivides vertebrates into specific classes. Additionally, there are fill-in-the-blank questions related to animal classification.

---

Solution:

#### Q1. Label the following diagram to classifying animals.
The diagram is already labeled correctly in the solution provided. Here is a breakdown of the classification:

1. Main Division:
- Animals are divided into two primary groups based on whether they have a backbone:
- Vertebrates: Animals with a backbone.
- Invertebrates: Animals without a backbone.

2. Subdivision of Vertebrates:
- Vertebrates are further classified into five major groups:
- Mammals: Animals like cows that have fur, mammary glands, and give birth to live young.
- Birds: Animals like birds that have feathers, beaks, and lay eggs.
- Fish: Animals like fish that live in water, have scales, and breathe through gills.
- Reptiles: Animals like snakes that have scaly skin, lay eggs, and are cold-blooded.
- Amphibians: Animals like frogs that can live both in water and on land, have moist skin, and undergo metamorphosis.

The diagram is correctly labeled as follows:
- Top level: "Classifying Animals"
- Left branch: "have a backbone" → Vertebrates
- Subcategories: Mammals, Birds, Fish, Reptiles, Amphibians
- Right branch: "don’t have a backbone" → Invertebrates

---

#### Q2. Fill in the blanks with suitable words.
Let’s address each part of the question:

a) All living things are classified into ______ main groups called kingdoms.
- The correct answer is five.
- Explanation: Living things are typically classified into five main kingdoms: Animalia, Plantae, Fungi, Protista, and Monera (or Archaea and Bacteria in some classifications).

So, the completed sentence is:
- All living things are classified into five main groups called kingdoms.

---

b) The two main groups of animals are ______ and ______.
- The correct answers are vertebrates and invertebrates.
- Explanation: Animals are primarily divided into two broad categories based on the presence or absence of a backbone (spinal column):
- Vertebrates: Animals with a backbone (e.g., mammals, birds, fish, reptiles, amphibians).
- Invertebrates: Animals without a backbone (e.g., insects, arachnids, mollusks, etc.).

So, the completed sentence is:
- The two main groups of animals are vertebrates and invertebrates.

---

c) Vertebrates have ______ inside their bodies.
- The correct answer is backbones.
- Explanation: Vertebrates are defined by the presence of a backbone (also known as the spinal column), which provides structural support and protects the spinal cord.

So, the completed sentence is:
- Vertebrates have backbones inside their bodies.

---

Final Answers:

1. The diagram is correctly labeled as shown in the solution.
2. Fill-in-the-blank answers:
- a) All living things are classified into five main groups called kingdoms.
- b) The two main groups of animals are vertebrates and invertebrates.
- c) Vertebrates have backbones inside their bodies.

Final Answer:
\boxed{five, vertebrates, invertebrates, backbones}