Biomes on earth have exhibited changes throughout history that have been caused by a variety of factors. over the past 50 years, the amount of tropical rainforest acreage found throughout the world has decreased from 14.8 billion acres to 8.6 billion acres due to deforestation. what factor is likely most responsible for the changes observed in the world’s rainforests?

a. volcanic activity
b. human activity
c. temperature changes
d. solar eclipses

b.human activity

Explanation:

Deforestation is a human-driven process of the tree removal. Destruction of forest is  performed fro many reasons: urbanization of the land, industry, farms, wood and paper production etc. It increased over the past 50 years and the main target are tropical rainforests. The trees are burned or cut by humans who leave the destroyed ecosystem behind.

Deforestation affect the animals and plants that lived there, but also humans and the effect even have global consequence (global water cycles, warming).

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.