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Q. How do birds reproduce?
Birds like every vertebrate have sexual reproduction. Their embryos develop within shelled eggs containing extraembryonic membranes and exterior the mother's body.
Birds copulate. Fecundation is interior and it occurs only before the female gamete is involved by the calcareous eggshell.
give the discriptive account of nerilla which belongs to class arciannelida in phylum annelida
What is Temperate Grasslands? Grasslands are known by their common names in different regions of the world, such as the plains or prairies in North America, the steppe in Asia,
Etiology Fevers can be caused due to 1. Internal (endogenous) factors: This could be caused within the body. Examples are antigen-antibody reactions, malignant cancer, graf
Human disorders are increasingly being diagnosed and treated using biotechnological applications such as: Genetic testing, containing testing of adults by to pre-birth diag
If molecules diffuse down their concentration gradient and achieve equal concentration throughout a container or cell, does all movement stop? Explain your answer.
Diagram of a cell surface membrane. State the width of a cell surface membrane. (i) On which side of the membrane, shown in Figure, X or Y, is the cytoplasm of the cell?
What do protozoans "eat"? Do they move in search for food? Protozoans are heterotroph beings, i.e., they do not make their own food and therefore they require to search for it
Excretion in Protozoans Excretion of metabolic wastes is dope almost exclusively by diffusion. All protozoans are ammonotelic i.e., the end product of their nitrogen metabolis
Sour taste is usually due to the presence of acids such as acetic acid, citric acid, benzoic acid. Upon dissociation, the acids give H ions which impart acidity. More the H ion con
Classification of the river zones The course of a river can be classified in two ways Firstly by its physical characteristics and Secondly by the presence or absen
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