。
She has a degree in biology.
Literal
She [topic-は] biology [possessive-の] degree [object-を] has.
生物学 (せいぶつがく) means 'biology' — literally 生物 (living things) + 学 (study). 学位 (がくい) means 'academic degree.' 持っている (has/possesses) describes having obtained and currently holding the degree.