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.

the answer is cell division : )

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.