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Q. What is circulation?
Circulation is the movement of substances like gases within blood vessels and nutrients and cavities throughout the organism.
Q. Do all animals have a circulatory system?
Not all animals have a circulatory system Cnidarians, Poriferans, nematodes and platyhelminthes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems whichever.
Protozoans are microscopic in size however some are large enough to be seen with naked eye. Microscopic organisms such as these have numerous advantages, one of which is that they
What is meant by cellular secretion? Cell secretion is the elimination to the exterior of substances formed by the cell (for instance, hormones, mucus, sweat, etc.)
describe the importance,principles,techniques and uses of microscopy
what is a plasmid
Q. What is the molecule that donates hydrogen for photosynthesis, in sulfur photosynthetic bacteria? In sulfur photosynthetic bacteria the substance that donates hydrogen is hy
Q. What are pericardium, pleura and peritoneum? Pleura are the membrane that covers the inner wall and the lungs of the chest pericardium are the membrane that covers the heart
The mirrows reach or grayling zone This zone has a less steep gradient, than the trout beck. The river here still flows swiftly, though the current is not fast and conditions
STOMACH It is wide, J-shaped, placed obliquely on left side in upper abdominal cavity so left kidney is slightly down ward. It is 30 cm, long and 15 cm. wide. It has g
What are the typical vegetation and the typical fauna of the deserts? The predominant fauna of the desert ecosystems is formed by reptiles, like snakes and lizards, terrestrial
What does skin color in man shows?
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