In 2012, the United States produced 2,068 million metric tons of CO2 from electricity alone. Let x be the amount of CO2 produced by the United States that year from transportation. Based on the chart, what equation can be used to solve
for x? Units are in million metric tons.

but there is no

i guess you forgot putting it.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.