Final answer:
The Paleolithic Era is marked by the use of stone tools, cave paintings, and hunter-gatherer societies, beginning around 2.5 million years ago and ending around 10,000 years ago.
a is correct
Step-by-step explanation:
The markers of the Paleolithic Era, also known as the Old Stone Age, are characterized by the development and use of stone tools and the presence of hunter-gatherer societies. The Paleolithic Era began around 2.5 million years ago and ended approximately 10,000 years ago. Significant evidence from this period includes stone tools, such as Oldowan and Acheulean tools, cave paintings, and the advent of important technological and cultural practices like the control of fire, development of language, and the creation of early art forms.
The use of simple tools began with our hominin ancestors and became more sophisticated over time, leading to later Paleolithic innovations such as the Clovis points. The era ended with the transition to farming and domestication of animals, marking the beginning of the Neolithic Age.