Which of the following is one of the five causes of a business cycle?
a. decrease in consumer demand
c. recession
b. external shocks
d. none of the above

C recession is one of the five causes of a business cycle. 
Business cycles are measured by looking at the growth rate of the gross domestic product of a country. There are five causes of a business cycle:
1. Changes in interest rates2. Changes in house prices3. Changes in consumer and business confidence 4. The local or world economy moves into a recession5. The local or world economy moves out of a recession. 
These causes can also be seen as unstable fluctuations rather than stable cycles. 

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hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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