The parallax method of measuring star distances gives most accurate results when the gap between two observations of a star is about six months. which of these statements best explains why a gap between observations affects the accuracy of the star distance? a. it allows the star to complete its life cycle and evolve from one form to another. b. it ensures that measurements are taken from two points which are very far apart. c. it makes up for the changes in the star's position due to its movement around the sun. d. it to take the measurement of changes in the position of the star due to supernova explosions.

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit