Give four salient features of Arthropoda.

Explanation

To answer the question regarding the salient features of Arthropoda, we can outline the following four key characteristics:

1. **Segmented Body Structure**: Arthropods have a body that is divided into segments, which are typically organized into three main regions: the head, thorax, and abdomen. This segmentation allows for specialization of body parts and functions.

2. **Chitinous Exoskeleton**: The body of arthropods is covered by a hard exoskeleton made of chitin. This exoskeleton provides protection, support, and helps prevent water loss, which is particularly important for terrestrial species.

3. **Open Circulatory System**: Arthropods possess an open circulatory system where the blood (hemolymph) is not confined to blood vessels. Instead, it flows freely through cavities in the body, allowing for direct contact with the organs.

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