A covalent bond is formed when atoms share valence electrons. Which group of elements form covalent bonds?

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Solutions to environmental problems in europe must