We will use the Descartes` rule of signs and see how many times the signs change from positive to negative and from negative to positive from one term to the next ( two consecutive terms are with different signs ).
In this case it is 4 times ( +7x13 to -12x9, -12x9 to +16x5, +6x5 to -23 x and finally -23x to +42 ).
Answer: There are 4 real zeroes.
The answer would be C - Beekeepers maintaining colonies of bees and moving them to different farms and orchards.
D, because all of the other options say that humans do not cause it, or that it is based on false data.
Electric energy is the type of energy that a heated oven has cuz it uses electicity
