List the various types of cleavage seen in animals .

Explanation

**Step-by-Step Solution:**

1. **Introduction to Cleavage**: Cleavage is the process of cell division that occurs in the early stages of embryonic development. It leads to the formation of a multicellular embryo from a single fertilized egg (zygote).

2. **Types of Cleavage**:
- **Holoblastic Cleavage**: This type of cleavage involves complete division of the zygote into smaller cells called blastomeres. Holoblastic cleavage can be further classified into:
- **Equal Holoblastic Cleavage**: The cleavage furrows divide the egg into equal-sized blastomeres. This is typically seen in organisms like sea urchins and frogs.
- **Unequal Holoblastic Cleavage**: The cleavage furrows divide the egg into unequal-sized blastomeres. This is commonly observed in mammals, including humans.
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