Where is the lid for this pot?

This chemical reaction is in equilibrium.

His success is an example of the proverb 'one general achieves success at the cost of ten thousand bones'.

He crossed the border and fled to the neighboring country.

This software maintains backward compatibility.

He is an expert in ethology, and his research is highly regarded worldwide.

I used an optical microscope for an experiment at school.

I mainly use public transportation facilities for commuting.

Protein-degrading enzymes play a role in breaking down unnecessary proteins in the body.

Demography is an important tool for understanding various aspects of society.