Which river in south america's tropical north flows west to the pacific ocean

there is no chart here so no one can answer this.

i think the answer is b.

by 1880, germany had more rail lines than great britain and russia.

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.