Well, the body has a endless supply of energy (even if you have an energy drink or a lot of coffee) but anyway we will always have a lot of energy until you have to go to the other world (if you know what I mean)
A. they have a higher proportion of adenine–thymine than guanine–cytosine base pairs.
The option A represents the complete opposite of "high-gc gram-positive bacteria". High GC content means that this bacteria have more guanine ans more cytosine than the other base pairs- adenine–thymine. This means all the other options are correct.
It is mostly glass and fiber glass
B) the amount of available resources