I often use vegetable oil for cooking.

He is majoring in botany at university.

He is a specialist in that field.

My son is interested in dinosaurs.

This festival is held every year.

Chrysophyta perform photosynthesis underwater, supplying oxygen.

Phytobenthos is an important part of the marine ecosystem.

This biennial plant matures and blooms over the course of two years.

He is an expert in phytopathology, making a significant contribution to agriculture.

He is my best friend.