Extinction refers to the death of species with no further generation. It does not happen in a few years but gradually after few hundred or thousand years, a species become extinct. Similarly, speciation is the formation of new and distinct species in the course of time. Few species extinct and few evolve gradually.
Basically, these both are parts of evolution, because evolution is defined as the process in which living organisms develop and diversify from earlier forms during the history of the earth.
Polar air masses are characterized by cold air near the surface while tropical air masses are warm or hot.
Answer:
Independent: amounts of oil
Dependent: amounts of popped kernels
Controlled variables: Kernel brand, cooking time, popping time
Explanation:
Independent variables are what are changed in the experiment. The dependent variables depend on the independent so they are what is affected each time. Usually this is what is being tested for. Controlled variables are those that aren't being tested and are kept the same each time to make sure it doesn't change the outcome.
C! MOON'S gravity. i got this one right