The sugar-phosphate backbone of DNA is held together by covalent bonds.     The strands of DNA are joined by hydrogen bonds (H-bonds) between the nitrogenous bases o â¦ n either side. Adenine is joined to Thymine by 2 H-bonds. Cytosine is joined to Guanine by 3 H-bonds.
The mother will leave the nest and the newly hatched chicks sometimes for long periods of time to eat, drink or take a bathroom break. In some species the father will then take over nest duties, but in hummingbirds, itâs up to the mother to tend the eggs and the babies.
If your bird lays a few eggs and then sits on them, leave the eggs in the cage for 21 days or until she loses interest. If however she does not stop at 3 â 4 eggs and continues laying, this strategy may not work, and you should call your avian veterinarian for further suggestions.