10 points How may the formation of a gas indicate that a chemical reaction has occurred?

Formation of a gas or precipitate indicates that an irreversible reaction has occurred

Formation of a gas indicates that a physical reaction has occurred

Gases are given off every time a chemical reaction occurs

Formation of a gas is a physical property of all chemical reactions

Item at position 4
4

Give an example of a trait that is controlled by more than one gene.

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.

Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?