Fast ! which of these is the most likely use of an electromagnetic wave which has frequency lesser than ultraviolet rays but greater than infrared radiations?

a-heat food safely
b- make objects visible to humans
c-transmit radio and cellular phone signals
d- detect the location of objects which emit heat

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Explain why ecosystem diversity results in species diversity in a healthy biosphere

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.