Why is carbon considered tetravalent? a. since it has four electrons in its outermost orbital, it needs four more electrons to complete its octet. b. since it has two electrons in its outermost orbital, it needs four more electrons to complete its octet. c. since it has four electrons its outermost orbital, it can donate four electrons to complete its octet.

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geographical equipment to analyze the composition of rocks

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars