#1 the water held back by a dam is an example of which type of energy?
(a) chemical energy
(b) mechanical energy
(c) kinetic energy
(d) potential energy
#2 a swinging pendulum demonstrates which type of energy?
(a) both potential and kinetic energy
(b) chemical energy
(c) only kinetic energy
(d) only potential energy
#3 how can you increase the period of a pendulum?
(a) by making the string longer
(b) by making the string shorter
(c) by taking away mass
(d) by adding mass

Which layer will become saturated first when rain falls?

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.

Asegment id dna that is artificially created from two or more organism through use of dna enzymes in a laboratory is called a segment of dna that is artificially created from two or more organisms through use of dna enzymes in a laboratory is called