This occurs when colder air advances toward warmer air. O Warm Front
O Stationary Front
O Cold Front
O Occluded Front

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere