Why is the cleavage in mammals referred as simple holoblastie?

Explanation

### Step-by-Step Solution

1. **Definition of Cleavage**: Cleavage is the series of rapid cell divisions that occur after fertilization, leading to the formation of a multicellular embryo from a single-celled zygote.

2. **Understanding Holoblastic Cleavage**: Holoblastic cleavage refers to a type of cleavage where the entire egg is divided into smaller cells. This is in contrast to meroblastic cleavage, where only a part of the egg divides due to a large amount of yolk.

3. **Characteristics of Mammalian Eggs**: In mammals, the eggs are classified as microlacetal, meaning they contain a small amount of yolk. This is significant because the low yolk content allows for complete division of the egg during cleavage.

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