Question

the eggs laid at one time by sparrow,its incubation period and the appearance of the eggs

Answer 1

Hey brother here is the explanation.
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If all goes well, the sperm penetrate through the wall of the ovum (egg) and fertilization takes place. During the first stage of embryonic development, the egg shell develops; pigments are added last. Ovulation and laying take about 24 hours, so female birds typically produce at most one egg per day.

hope it helps