Which of the following might be expected to decrease the disperal of plant species over a religion?

The dispersal of plant species occurs when the seeds of the plants are dispersed over different areas by animal means, wind, insects etc.

If the population of the organisms which help in the dispersal of the seed declines, then the dispersal of the plant species will also decline.

Hence, animals and insects are very important for the dispersal of seeds of plants over a region.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.