Palaeontology Study

The question asks about the subject of study in the field of palaeontology.

Palaeontology is a scientific discipline that focuses on the study of ancient life. This is primarily done through the examination of fossils.

Let's look at the given options:

• Bones: While palaeontologists often study fossilized bones, the field is not limited to just bones. It includes fossilized plants, microorganisms, tracks, and other evidence of past life. Osteology is the study of bones.
• Primates: Primatology is the study of primates. While fossil primates are studied within palaeontology (specifically palaeoanthropology or primate palaeontology), palaeontology covers all forms of ancient life, not just primates.
• Fossils: Fossils are the preserved remains or traces of organisms that lived in the distant past. Palaeontology is precisely the study of these fossils to understand ancient life, environments, and evolutionary history.
• Birds: Ornithology is the study of birds. While fossil birds are a subject within palaeontology, the field encompasses all ancient life forms represented by fossils, not exclusively birds.

Therefore, the core subject of study in palaeontology is fossils.