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Topic: Egg (biology)

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	Bird eggs (Egg biology)
		Usually after fertilization, the bird egg is laid by the female and is incubated for a time that varies according to the species; then a single young hatches from each egg.
		Some birds lay eggs even when not fertilized, and it is not uncommon for pet owners to find their lone bird nesting on a clutch of infertile eggs.
		The eggs of modern reptiles are all white.
	www.photobirds.com /pub_6_Bird_eggs.html (530 words)

	ScienceDaily: Biology
		Biology is the branch of science dealing with the study of life.
		At the organism level, biology has partially explained phenomena such as birth, growth, aging, death and decay of living organisms, similarities between offspring and their parents (heredity) and flowering of plants which have puzzled humanity throughout history.
		Biology -- Biology is the branch of science dealing with the study of life.
	www.sciencedaily.com /encyclopedia/biology (1463 words)

	Egg (biology) Summary
		The word oviparous refers to animals that lay eggs which hatch externally.In other words the female retains the fertilized eggs in her body until they hatch, so that "live" young are born.
		Non-passerines typically have white eggs, except in some ground-nesting groups such as the Charadriiformes, sandgrouse and nightjars, where camouflage is necessary, and some parasitic cuckoos which have to match the passerine host's egg.
		The colour of individual eggs is also genetically influenced, and appears to be inherited through the mother only, suggesting that the gene responsible for pigmentation is on the sex determining W chromosome (female birds are WZ, males ZZ).
	www.bookrags.com /Egg_(biology) (1581 words)

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