Which forestry practice decreases competition and improves the overall health and productivity of a forest? a. desertification b. clear-cutting c. slash-and-burn d. thinning

Answer is (D) Thinning

Thinning is the forestry practice of selectively removing certain trees to increase the productivity of the forest. Example eucalyptus trees have a higher water consumption and demand. Now if there are several such trees in a forest, it will affect the water demand of the other trees. It will be competing for resources. Hence by selective removal of such trees, the health of a forest can be boosted.

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.