Microorganisms, Bacteria and Viruses. Microbiological contamination of water has long been a concern to the public. From the 1920's-1960's, the bacillus which causes typhoid fever was considered a major problem in the water supply (1). Once it was eradicated, new microbes were present to take its place.
How long does a mourning dove sit on her eggs for them to hatch? Robins keep the clutch cool before the last egg is laid so the nestlings all hatch at approximately the same time. Incubating is done mainly by the female, who rarely leaves her clutch for more than a few minutes at a time.
Answers. Best Answer: A robin's eggs will hatch approximately 12-14 days after she lays them. How long she can stay away, finding food for herself, depends on the weather.If it is cool and rainy, she will not stay away as long as she might on a hot, sunny day.That is because she knows by instinct when she needs to keep her eggs warm, and when they can stay warm on their own for a while.f it is cool and rainy, she will not stay away as long as she might on a hot, sunny day. That is because she knows by instinct when she needs to keep her eggs warm, and when they can stay warm on their own for a while.