Final answer:
The WT 15000 skeleton is of a Homo ergaster child around 8 years old, with an estimated height of 1.6 meters based on similar well-preserved remains known as the Nariokotome Boy.
Step-by-step explanation:
The WT 15000 skeleton was that of a Homo ergaster of about 8 years old with an estimated height of about 1.6 meters. This is evident from the most well-preserved skeleton of a young Homo ergaster individual, known as the Nariokotome Boy. The remains suggest the boy was roughly 12 years old at the time of death, but given the growth patterns of Homo ergaster, an age of 8 years for a smaller specimen is reasonable. Homo ergaster is an ancestral species to modern humans that lived approximately 1.8 million years ago. They had notable features such as no strong chin, a low forehead, and an occipital bun on the skull.