Many factors affect soil fertility. One biotic factor would be the
A) mineral content of the soil.
B) moisture content of the soil.
C) number of earthworms in the soil.
D) presence or absence of toxic chemicals.

Mexico city is an example of how humans alter their environment because it was a. one of the world’s largest cities b. built on drained and filled lake beds c. built after conquest by the spanish d. once the capital of the aztec empire

Fertility and mortality rates are higher in more developed nations.

Following the new zealand wars, the british government