The <span>attraction between a slightly positive hydrogen atom and a slightly negative atom often oxygen or nitrogen</span> is called covalent bonding. This type of bond happens when electrons are being shared by atoms in order to be more stable. Hope this answers the question.
Placental mammal is the answer.
<span>The adaptation that would be most useful to an insect that lives in the grass is A. green coloration. This would be a useful adaptation for them because now they could camouflage easily - grass is green, and if they are also green and hiding in grass, nobody can spot them easily, which is a perfect way for them to hide from predators that may want to eat them.</span>
