What is a main source of pollution for Lake Okeechobee, A. Large amounts of sewage (human waste) are dumped into the lake.
B. Fertilizer from sugar cane fields flow into the lake.
C. Large amounts of oil from boat engines are released into the water.
D. Many factories line the shore of the lake and contaminate the surrounding water.

In the practice of science, this type of reasoning is used to develop explanations.

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.

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?