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Are the extraembryonic membranes the same in all vertebrates?
The presence of each extraembryonic membrane varies according to the vertebrate class.
In fishes and amphibians only the yolk sac is present. In reptiles and birds besides the yolk sac there are also the amnion, the chorion and the allantois. In placental mammals besides all these membranes the placenta is present too.
Pollination Pollination refers to the transfer of pollen from dehiscing anthers to the pistil. Unlike animals, plants cannot move to their mates for sexual reproduction. Henc
Q. Explain about Coronaru Heart Diseases? Coronary heart disease is a broad term comprising of a spectrum of diseases associated with disorders of the circulation, heart muscle
Nucellus - Seed In a large majority of flowering plants the nucellus is gradually utilized by the endosperm or embryo. In leguminous seeds, for example, the nucellus degenerat
What are the plant tissues that constitute the functional structures of the leaf veins? Leaf veins are made of vascular tissues. They are constitute by xylem and phloem that re
In certain instances differences in the morphology of genitalia between species make it impossible for normal mating to occur, and sympatric species tend to remain isolated. When t
#questiocan you help in a biology question?.
what are the chemical changes during cleavage
Earthquake creates seismic waves that travel through and around the surface of the earth. Seismic waves are the waves of energy caused by sudden breaking of rocks during an earthqu
Q. What is the etiological agent of amebiasis? How it transmitted and what are the typical manifestations of the disease? The Amebiasis is caused by the protozoan Entamoeba his
Q. Atypical Distribution of Pleural Fluid? i) Lamellar effusion: These are shallow collections of fluid between the chest wall and the lung surface. ii) Subpulmonic
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