According to the usgs, how much total copper was contained in world reserves as of 2018?
a. 45 million tons
b. 300 million tons
c. 5 million tons
d. 790 millions tons

The correct answer is D. 790 million tons

Explanation:

According to the United States Geological Survey (USGS), in the annual copper report survey of 2018, it was stated that the total amount of copper world reserves was estimated in 790 million metric tons. It should be noted that the projected global refined copper consumption for 2017 was around 24 million metric tons. An additional data is the slightly increase in copper world reserves for the 2019 year, around 830 million metric tons.

the answer is a or when it says crossing over

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".