Population density is calculated by
a dividing the number of organisms in a region by the land area
b. multiplying the number of organisms in a region by the land area
c. dividing the land area by the number of organisms in the region
d. by subtracting the land area from the number of organisms in a region

Where did the domestication of crops and animals begin?

Describe hiw the meanings of the constitutional clauses that grant powers to congress have been defined

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.