He lost his memory due to damage to the cerebral lobe.

Hasegawa is my friend.

When spring comes, the forest begins to come into leaf.

When spring comes, the trees in the forest come into leaf.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

Well then, I'm off.

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

Chrysophyta perform photosynthesis underwater, supplying oxygen.

He is an expert in paleobotany.

He is an expert in paleobotany, conducting research on plants from the dinosaur era.