The outer protective layer of the plant, formed from the cork cambium and includes the cork cells.

A severe gum infection that damages the soft tissue and bone supporting the teeth.

The specialized tissues surrounding and supporting the teeth, including the gums, periodontal ligaments, and alveolar bone.

A dense layer of vascular connective tissue that covers bones except at the surfaces of the joints.

The space between the layers of the peritoneum that surrounds the abdominal organs.

The serous membrane lining the abdominal cavity and covering the abdominal organs.

A geologic period that occurred from about 299 to 252 million years ago, the last period of the Paleozoic era.

A small organelle found in the cytoplasm of eukaryotic cells, responsible for breaking down fatty acids and detoxifying harmful substances.

The final period of the Paleozoic era, lasting from approximately 323 to 299 million years ago.

Phosphoenolpyruvate carboxylase, an enzyme that catalyzes the conversion of phosphoenolpyruvate to oxaloacetate in plants.