What has happened in the last 50 years that would make the carbon dioxide levels change?

question options:

a) continents have moved and altered the air

b) decreased levels of ozone are found in the upper atmosphere

c) the changes in earth’s orbit due to milankovitch cycles

d) increased burning of fossil fuels by people

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What is the full meaning of rfid on computer

[ou.01]which of these is the most likely use of an electromagnetic wave which has wavelength shorter than microwaves but longer than visible light? o heat food safely o neat food safely o take images of bones and teeth o transmit radio and cellular phone signals o take images of bones and teeth o transmit radio and cellular phone signals o detect the location of objects which emit heat

Which of the following best describes brazil's economy from 1650-1880? a. it gradually shifted to manufacturing as the industrial revolution progressed. b. it was based on mining. c. it was based on plantation agriculture, where slaves served as a labor force. d. it was based on small, family-owned farms.