Periods of growth for the economy followed by downturns describes real gdp final goods and services economic cycle

The correct answer is Economic cycle.

The natural fluctuation in economy between the period expansion (economy growth) and contraction (recession) is known as the economic cycle.  

The normal growth and downturn in the economy is the basic definition of Economic cycle.

During the time of expansion the investors seek to purchase companies and shares and during the time of contraction the investors look to invest and purchase the companies such as utilities and healthcare.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

b

explanation: