Covalent bonds are in the air you breathe and the water you drink. how are covalent bonds formed?

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.