During which section of the geologic time scale did the first modern human evolve?

a. during the paleogene period of the cenozoic era
b. during the quaternary period of the cenozoic era
c. during the cretaceous period of the mesozoic era
d. during precambrian time

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

What is the "great pacific garbage patch"? a large area of marine debris concentrated by rotating ocean currents a large area around the pacific rim where debris collects from natural disasters such as tsunamis an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability a large trash dump located in hawaii

What is a cordon and where is it found