He is a cat lover and plays with his cat every day.

Various plants and animals inhabit this park.

He ended up in a vegetative state after the accident.

Sandwich compounds are being studied in a branch of chemistry.

His most favorite food is sushi.

Amphoteric oxides have the characteristic of reacting with both acids and bases.

Acidic oxides react with water to produce acids.

Aluminum is an amphoteric oxide, it reacts with both acids and bases.

Basic oxides react with acids to produce salt and water.

Protozoans are single-celled organisms.