A person sprints across a football field to make the touchdown. The person’s muscles use up most of the oxygen in the blood to accomplish this. Which response do you predict would happen because of this? A. The pulse and breathing rate increases to provide more oxygen.

B. The blood pressure drops because of a drop in blood volume.

C. The muscles begin to use carbon dioxide to power contractions.

D. The heart rate decreases to give more time for oxygen to enter.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

the answer is b.) hydrogen bonds between bases.

b. to discover aspects of the natural world.

hopefully i .