Consider what you know about biotic and abiotic factors in an ecosystem. What is one of the reasons that nutrients in a vegetable patch might be considered abiotic? Nutrients can come from dead plants which have decomposed.

Available nutrients affect the carrying capacity of garden plants.

Nutrients are mostly obtained from the soil.

Nutrient levels can change with changing ecosystems.

1) nutrients are mostly obtained from the soil

2) a stand of aspen trees dies and decays, leaving a clearing in the forest

3) it is studying the ecosystem

4) beetles and weevils are introduced to feed on the invasive purple loosestrife plant, reducing the number of loosestrife without impacting other plant species

5) the number of variables

Explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.