Natural classification system were based on(a) Natural affinities amongst organism (b) Ultra structure and anatomy(c) Embryology

The natural classification system was based on natural affinities amongst organisms. This system was developed by early naturalists who classified organisms based on their shared natural features. These features could include physical characteristics, habitat, behavior, and more.

Here are the steps to understand this:

1. Natural Affinities Amongst Organisms: The natural classification system was primarily based on the natural affinities amongst organisms. This means that organisms were grouped together based on their shared natural characteristics. For example, all birds were grouped together because they all have feathers, beaks, and lay eggs.

2. Ultra Structure and Anatomy: While the natural classification system was not directly based on ultra structure and anatomy, these aspects were often considered when determining the natural affinities amongst organisms. For example, organisms with similar anatomical structures were often grouped together.

3. Embryology: Like ultra structure and anatomy, embryology was not a direct basis for the natural classification system. However, it was often considered when determining the natural affinities amongst organisms. For example, organisms with similar embryological development were often grouped together.

In conclusion, while ultra structure, anatomy, and embryology were often considered in the natural classification system, the primary basis for this system was the natural affinities amongst organisms.