He needs long-term drug therapy.

He claims to have seen an unidentified flying object.

Invertebrates are a type of creature without a skeleton.

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

Biotechnology plays a very important role in the medical field.

I am majoring in developmental biology at university.

Coelenterates are said to be the first animals with a true body cavity.

His tribe has been practicing zoolatry since ancient times.

He is studying about ancient animal worship.

Chrysophyta perform photosynthesis underwater.