In Hydra, wastes of food digestion and nitrogenous wastes are removed from
Mouth and body wall
Body wall and body wall
Mouth and tentacles
Mouth and mouth
Organisation of Cell
Animal Tissues
Human Nutrition
Human Respiration
Origin and the Evolution of Life
Chromosomal Basis of Inheritance
Genetic Engineering and Genomics
Human Health and Diseases
Human Locomotion
Circulation
Excretion and Osmoregulation
Control and Coordination
Human Reproduction
Organisms and Environment-II
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