Final answer:
Large brains did not appear first in early evolution. The increase in brain size coincided with the emergence of Homo sapiens and was likely driven by factors such as climate change and the need to adapt to an unpredictable environment.
Step-by-step explanation:
Early evolutionists believed that large brains appeared first, leading to certain features. However, the current understanding is that brain size increased rapidly between 800,000 and 100,000 years ago, coinciding with the emergence of Homo sapiens. This increase in brain size was likely driven by factors such as climate change, which created a more unpredictable environment. Bigger brains helped our ancestors survive by enabling the development of culture, technology, and behavioral adaptations to exploit the environment.