Experimental Research 1. A tobacco company wants to encourage the use of cigarettes and
puts out an ad suggesting that nicotine may enhance reaction time
and therefore driving ability. Is there some truth to their suggestion
since nicotine acts as a stimulant when bound to receptors on
muscle fibers? Find a partner and design a simple experiment to test
the hypothesis that nicotine enhances driving ability.
2. Operationally define your independent variable and dependent
variable.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.