• Dr. Smith wants to examine whether a new drug increases the maze running
performance of older rats. Just like aging humans, older rats show signs of poorer
memory for new things. Dr. Smith teaches two groups of older rats to find a
of tasty rat chow in the maze. One group of rats is given the new drug while they
are learning the maze. The second group is not given the drug. One week after
having learned the maze he retests the rats and records how long it takes them to
find the rat chow.
Independent Variable:
Dependent Variable:

Independent Variable: Give one group the drug and dont give the other group the drug

Dependent Variable:The data of if the drug improves the rats memory(if their memory is better, the same, or made worse)

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick