Question

consider the cladogram representing most of the major categories of animals. what physical characteristic is used to divide the animals into the two main clades? a cold or warm blooded b endo- or exoskeletons c aquatic or terrestrial d appendages or no appendages

Explanation:

The two main clades of animals are typically divided by body structure: one with internal skeletons (endoskeletons, e.g., vertebrates) and the other with external skeletons (exoskeletons, e.g., arthropods) or no hard skeleton. This is a primary physical characteristic for major animal clade division.

Answer:

B. endo- or exoskeletons