When raymond observes certain natural phenomena, he often forms ideas about their causes and effects. suppose that raymond surmises that leaves change color in autumn due to scarcity of sunlight. in order to test whether his idea is accurate, he must first construct a falsifiable that defines a clear relationship between two variables. raymond's next step is to that would isolate and test the relationship between the two variables. this task can be pretty daunting because raymond will need to identify and eliminate any variables that could confuse test results.

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

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

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?