Question

Identify the word pair relationship.
________ : Annelida
Jointed legs : ________

• A. Metamerism
• B. Arthropoda

Answer 1

Annelids:

1. In annelids, the body is divided into segments internally and externally. This is known as metameric segmentation.
2. The body cavity is completely lined by epithelial cells from the inner and outer sides.
3. They exhibit organ system level of body organization and bilateral symmetry. They are triploblastic, metamerically segmented, and coelomate animals. For example, earthworms.

Arthropoda:

1. Arthropods include animals with jointed appendages.
2. The body is segmented and each segment bears jointed appendages and possesses a chitinous exoskeleton.
3. The body is divided into three parts: head, thorax, and abdomen. For example, grasshopper.

Final answer: Metamerism : Annelida, Jointed legs: Arthropoda.