Astudent is given a small amount of unknown tan-colored liquid substance. this unknown liquid is placed into a glass of water and mixed. despite mixing, the tan liquid remains separated from the water and collects as a large droplet at the top. which of the macromolecule groups is this liquid most likely to be a member of? select one of the following choices: nucleic acids. proteins. lipids. carbohydrates

What is the following best defines climate?

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.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?