Two balloons are hanging from a string. A students comes along and rubs the balloons on their hair. When they let go the balloons are pushing away
from each other. What is the reason the balloons repel?

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved

Ineed pls urgent 1-20 in order and fully detail step my step.