A science teacher claims to have invented a fan that will run forever, given a little bit of starting power. The fan consists of two sets of blades; the first set operates like a fan and the second acts like a wind turbine. When the fan is plugged in, the wind generated blows the turbine, which generates the electricity to run the fan, and so on. What will happen when the fan is unplugged? Will the fan run forever as claimed? Why or why not?

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and colour.

explanation:

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

the answer is d p: cell, q: organ, r: organ system, s: tissue

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time