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Q. Do echinoderms have an excretory system? How is excretion done in these animals?
Echinoderms do not have an excretory system their excretions are eliminated by diffusion.
Why is cannibalism an inharmonious intraspecific ecological interaction? In cannibalism an individual eats other of the same species (occurs in some insects and arachnids). Sin
Explain the role of Bones in human biology? Bone is covered by a tough outer membrane called the periosteum. The periosteum contains systems of capillaries that supply the bone
Explain the Transport of Amino Acids? More than one transport or carrier system functions in the absorption of amino acids. The active carrier system for neutral amino acids sh
Define classification of carbohydrates - Disaccharides? Disaccharides are condensation products of two monosaccharide units joined together by a linkage called glycosidic linka
If porifers shiw cell aggregate plan tgen how can they also shiw division of labour among cells
What do you understand by Parapodia? Paired lateral, unjointed appendages of polychaete worms. Parapodia have a variety of shapes, and their appearance is related to their nume
Definition of osmosis A) The best explanation of osmosis is 'The movement of water from a dilute solution to a concentrated solution across a partially permeable membrane'.
what are the branches of botany?
Explain Theory of Evolution through Natural Selection The third theory of evolution through natural selection was put forward jointly by Darwin, and Wallace in 1859. This theor
Complete Metamorphosis In all Endopterygota insects, where wings and other structures develop internally, (in invaginate imaginal epidermal pockets) such as beetles, wasps, b
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