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Why can the allantois be considered an adaptation to terrestrial life?
The allantois is an adaptation to dry land because in embryos of oviparous terrestrial beings, like reptiles and birds, the metabolic residuals cannot be right away excreted to the aquatic surrounds (as fishes and amphibian larvae do). It was necessary then for the appearance of a structure capable of storing the embryonic excretes until hatching.
General information about disinfectants A disinfectant is a chemical that kills disease-causing agents on contact. Natural disinfection agents, such as sunlight, heat, keeping
Define Class – Arachnida? The class Arachnida (Arachnida = spider) has terrestrial and few aquatic animals. It includes spider, scorpions and mites. 1. Prosoma bears. six pair
Are viruses cellular organisms?
classification schemes and characterisitics used for this.
Explain about the Color vision of human eye The human eye can see about 150 different colours in the visible spectrum (400- 750 nm). Red, green and blue are said to be the prim
Q. Why is the cytoplasm of sperm cells very reduced? Why do mitochondria of sperm cells concentrate in the base of the flagellum? The reduced cytoplasm of sperm cells reduces t
Hygroscopic Coeflicient To have a more complete picture of soil moisture relations, let us take a soil sample and oven dry it for 24 hours at 11 o C. Now if this soil is kept i
Animal and Plant Cells The internal structural organisation and information related with hereditary characters and metabolic pathways are similar in all eucaryotic cells whethe
Are protozoans diploblastic or triploblastic ?
Transfer of pollen grains from the anther to the stigma of another flower of the similar plant is known as? Geitonogamy
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