This square matrix has the same number of rows and columns.

The diagonal elements of this matrix are all 1.

He is a world-renowned biologist.

Observing dark nebulae is difficult.

We conducted a spectral analysis to investigate the spectral characteristics of this substance.

He feels dizzy when he stands up suddenly due to orthostatic hypotension.

Astrobiology is a very interesting field of study.

He is an expert in biophysics.

I am majoring in biophysics at university.

Molecular biology is a field of study that understands life phenomena at the molecular level.