The namatodes are know as the round worm, since they have cylindrical body. They live as parasite in plant and animals, r are free living in soil

Roundworms have bilaterally symmetrical bodies which show several advances over those of flat worms.

Phylum Annelida

The annelids are the segmented worms With long cylindrical bodies. Most are marine worms, others lives in damp soil or fresh water.

Enzymes

Completex food substance taker by animals must be broken down into small particles , soluble and diffusable substances before they can bee absolved into the body and also enzymes are necessary for digestion.

Characters of enzymes

1, enzymes are soluble

2, enzymes are sensitive to temperature

Types of enzymes

1, digestive enzymes

2,hydrolysis enzymes.