Mention briefly about the circulatory system of earthworm

Explain the circulatory system of frog.

Brief about the respiratory system of cockroach ?

Identify the correct statements from the below about "Respiratory system of earthworm". (I) The earthworm has no special respiratory organs like lungs or gills. (II) Respiration takes place through the body wall. (III) Oxygen diffuses through, the skin into the blood. (IV) The skin is kept moist by mucous and coelomic fluid.

Write briefly about gene

Explain the circulatory system of cockroach.

Explain the nervous system of earthworm.

Explain Circulatory system of leech.

Explain the digestive system of earthworm.