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Why, even though they have an open circulatory system, can flying insects like flies beat their wings with great speed?
In insects the circulatory system is open but this system does not participate in the gas exchange process and in oxygen supply to the tissues. Gases go in and out by the independent tracheal system that permits direct contact of cells with the ambient air. Thus an insect can supply the great oxygen demand of its fast-beating wing muscles even having open circulatory system.
Why is it necessary to have the second division in meiosis even though cells have already been reduced to haploid number after the first division?
What is human eye Accommodation The human eye focuses at objects at infinity, without exerting any power. This means that when a person is observing an object at infinity, the
Where do PGA and glycine gain entry respectively after being formed during photorespiration in plants? What occurs to them immediately after?
Classification of Aquatic Organisms After discussing the common types of the aquatic ecosystem let us now study in brief the ecological classification of aquatic organisms. I
EXTERNAL GENITALIA - Vestibule is covered by 2 pairs of lips labia majoris and labia minoris. At the anterior junction of labia minoris a small erectile clitoris presen
Historically what were the two main evolutionary theories? The two major evolutionary theories were darwinism and lamarckism.
Glands - 1 . SEBACEOUS GLAND - Absent in palm and sole. Holocrine in nature. Branched, alveoli are present, sac like in appearance. Generally attached to fo
A diploid cell contains: A.one half of a complete set of chromosomes B.several complete sets of chromosomes C.the correct number of chromosomes D.two complete sets of chromosomes E
What are the Consequences of PEM? The consequences of PEM are most often long lasting and irreversible. The common consequences include: • Irreversible growth retardation
Phylum Ciliophora - Protozoan Simple cilia or compound ciliary organelles typical in at least one stage of life cycle; subpellicular cilia present even if surface cilia are ab
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