An ecosystem contains two types of giraffes, some with short necks and others with long necks. the distribution of this trait is equal among the population. a disease causes low-lying shrubs to die out. the long-necked giraffes can access more food, so they have a better chance of surviving to reproductive age. after several generations, all the giraffes ha

it is b

explanation: mark brainliest because i am trying to get to the next level and i just need 1 more

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