How can you tell if an atom has a negative charge? What type of Ion is this?

Which of the four major uses is predicted to change the least by 2020?

Matthew decided he wanted to hike up mount everest. on his way to the top, it began to snow and the temperature dropped to -10°f. matthew forgot to wear a heavy jacket so his body began to shiver beyond control. in this case, matthew's body shivering is the to a drop in temperature. * 0 points reflex stimuli responce environmental facto

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?