A covalent bond forms due to . a. Sharing of electrons

b. Transfer of electrons

c. Losing or gaining electrons

d. All of the above

Adaptive radiations can be a direct consequence of four of the following five factors. selectthe exception. a) vacant ecological niches b) genetic drift c) colonization of an isolated region that contains suitable habitat and few competitor species d) evolutionary innovation e) an adaptive radiation in a group of organisms (such as plants) that another group uses as food