All but one of the statements below describe gene flow. that is

a) it depends on a chance event that changes the gene pool
b) it can reduce the genetic differentiation between the two groups
c) it involves the movement of alleles from one population to another
d) it includes migration or the movement of individuals between population

A) it depends on a chance event that changes the gene pool

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

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /