Help!! its a timed exam

Several billion years ago which gas was the least prevailant in the atmosphere

Omar paddles a canoe downstream at a rate of 5 mi/hr. the stream is flowing at a rate of 12 mi/hr. what is the actual velocity of the canoe? a: 5 mi/hr, downstream b: 7 mi/hr, downstream c: 12 mi/hr, downstream d: 17 mi/hr, downstream

What is atp and what purpose does it serve in the human body?