A mutation that causes a human have 11 toes is (neutral, harmful, or beneficial.)

Having an extra toe or finger is not harmful at all, it is an uncommon chance for babies to be born with an extra toe or finger but most of the time it is amputated soon after the birth. It can't cause any harm. Though some scientists believe it could be beneficial for some stuff, such as tying a shoe with only one hand. Or playing numerous games at once. Though I would go with neutral.

P.S

Have an Amazing Day!

-Faker/Tosrel

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