Final answer:
Humans are categorized as having bilateral symmetry, triploblastic germ layers (ectoderm, mesoderm, endoderm), and are coelomates within the deuterostome group. They do not exhibit pseudocoelom or spiral, determinate cleavage; these traits are characteristics of other animal groups. Humans have radial, indeterminate cleavage patterns in embryological development.
Step-by-step explanation:
Humans are classified based on certain morphological and developmental characteristics, falling into specific categories from the most general to the most specific. Firstly, humans exhibit bilateral symmetry, meaning the body can be divided into nearly mirror-image halves along a single plane. This form of symmetry is associated with cephalization, the evolution of a concentration of nervous tissues and sensory organs in the head.
When considering the germ layers, humans are triploblastic, developing three primary layers during embryogenesis: ectoderm, mesoderm, and endoderm. These layers respectively give rise to the outer coverings of the body like skin, organs like muscles and bones, and the interior linings of organs.
Regarding the internal body cavity, humans are coelomates. A coelom is a true body cavity that is wholly encased within the mesoderm. It allows for the development of highly specialized organs and complex body structures. In the context of coelom development, humans belong to the group of deuterostomes, which are distinguished by their embryological development, including the anus forming from the first opening in the embryo (the blastopore) and the mouth being formed later.