Answer:
The magnetic field is generated by electric currents due to the motion of convection currents of molten iron in the Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo.
When was BSE first discovered?
BSE first appeared in British cattle in the mid-1980s. There have been numerous cases detected in other countries. A complete list of countries is available from both the U.S. Food and Drug Administration (FDA) and the U.S. Department of Agriculture (USDA).
<span>In the food web, there are different types of organisms. There are those who creates their own food from different resources. There are also those who feed on the other organisms. The first type discussed in this answer are the produces and the second type are the consumers. Thus, for this item, the answer is producers. </span>