Plz Help! 30 points Which of the following substances are used primarily to generate energy, like gasoline and electricity?

A. minerals
B. ores
C. fossil fuels
D. precious gems

Why is terracing used in southeast asian agriculture?

Look at the data above. provide an explanation for europe’s projected population decrease by the year 2050. (i'm doing this for future kids) the answer is : the percentage of people over the age of 65 and under the age of 15 in europe is currently the same at 16% each. therefore, the majority of the population is between the ages of 16 and 64. in forty years from now, in 2050, a greater percentage of the population will be over the age of 65. europe also has a relatively long life expectancy of 75 years. this, combined with a low birth rate means that by 2050 europe’s population will actually be less than it is today.

In the figure, polygon abcd is transformed to create polygon a′b′c′d′. this transformation is a by a factor of .