the effect of the soil build-up on the different organisms (plants and animals) in the pond and explain how the food chain will be affected.

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

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration

What is the radius of a circle whose equation is (x + 5)^2 + (y – 3)^2 = 42? 1. 2 units 2. 4 units 3 .8 units 4. 16 units