How do you classify the different biological zones in rivers and streams lengthwise?

The concept of classifying the river and streams is known as the river continuum concept which classifies the river into the sections after the occurrence of living organisms. Rivers can be classified as into three rough classifications namely : headwaters, mid-reaches and lower reaches.

For classification of river into the biological zones, it is classified into five zones. These zones are Periphyton, Vascular Hydrophytes, then periphyton again, then Phytoplanktons and the last is the Zooplankton.

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.

no sé si entiendes español pero te daría la respuesta si lo supiera, pero lo siento mucho