Two pure substances combine to make a new substance. The new substance cannot be physically separated and has a different boiling point than each of the original substances.
This new substance can best be classified as
an atom
an element
a mixture
a compound

One of the reasons that stars are so large is because

Abiologist counts the number of rabbits in a population each year and observes a decrease in population. since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. which describes the biologist’s actions? a.) experimentationb.) inferencec.) observationd.) interacting

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions