PLEASE I NEED HELP A swimming pool is an example of an open system. According to the law of conservation of energy, if swimmers add 12,000 J of thermal energy and the surrounding air removes 8,500 J of thermal energy, what is the total change in energy? A. A decrease of 8,500 J
B. A decrease of 3,500 J
C. An increase of 3,500 J
D. An increase of 20,500

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring