He suffered for a long time due to tabes dorsalis.

Analytical chemistry is a science for clarifying the components and structure of substances.

He is majoring in petrology at university.

He is an expert in tidology, studying the fluctuations of the sea's tides.

This beautiful zoisite necklace is my favorite.

This fossil is made of carbon.

We conducted a meta-analysis on this issue.

Protists are being studied in a branch of biology.

Arthropods are a large group of animals that include insects, spiders, shrimp, and crabs.

Carbohydrates are important as a source of energy.