Although scientists have studied tornadoes for years, the conditions that cause these storms to develop are not fully understood.
a. compound
c. compound-complex
b. complex

The byzantine empire weakened after asia minor

Some organisms have a large geographic range. for example, the norway rat lives on every continent except antarctica. a population of norway rats is the number of rats in one particular area. do you think it’s scientifically possible for a population of norway rats in north america to carry different genetic mutations than a population of norway rats in africa? do you think it’s possible that they carry some of the same mutations? what types of information can scientists learn by studying the genomes of these two populations of rats?

19which statement best summarizes how homesteaders responded to the hardships of the american frontier?