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How do birds reproduce?
Birds, like each vertebrate, have sexual reproduction. Their embryos develop within shelled eggs having extraembryonic membranes and outside the mother's body.
Birds copulate. Fecundation is internal and it happens only before the female gamete is included by the calcareous eggshell.
Feeding Mechanisms of Animals All animals have evolved successful methods for extracting their required nutrition from the environment. Thus we find a diversity of feeding mec
Define the Sources of Vitamin D? Vitamin D, also called the sunshine vitamin is easily manufactured in the skin from 7-dehydro cholesterol on exposure to sunlight, as already m
Q. What is the difference between tracheophytes and bryophytes? Bryophytes are nonvascular plants (liverworts, mosses, hornworts), that is they do not have a conductive system
Q What is the role of messenger the ribosomes and RNA for the protein synthesis? The mRNA is produced within the cellular nucleus and migrates to the cytoplasm where associated
The AV node of a mammalian heart is destroyed. A. A depolarization in a cell in the left atrium will cause a depolarization of a cell in the left ventricle. B. The contracti
Define in brief about the term - MRI MRI is a more recent development that was initially introduced as a rival to CT. The technique itself is complex, relying on measurement o
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Two parents who are each known to be carriers of an autosomal recessive alleles have four children. None of the children has the recessive condition. What is the probability that o
nervous system of vertebrates
Classify phylum mollusca?
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