This is a term use to describe an ecological community in which moisture and temperature are high.

Tropical forest

Explanation:

The tropical forest is an ecological community that is characterized with temperatures throughout all of the year, as well as high amount of precipitation and humidity. These ecological communities are located at the equator and near the equator, thus on the very low latitudes. They are home to more than half of the animal and plant species on planet Earth. They have the highest concentrations of living organisms, having also the highest diversification on the planet. The tropical forests are fascinating in every possible way, and it is a shame that the research in them is still largely descriptive, because the terrain and the conditions are extremely tough for any other method to be put in practice.

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement