What is the density of an object with a mass of 20 grams and a volume of 5 ml?

1. kepler's three laws resulted from his careful analysis of data, and were not derived from a mathematical model. a. experimental b. hypothetical c. theoretical d. observational 2. which of the following was the earliest solar system model to exist? a. aristotelian b. heliocentric c. copernican d. ptolenmiac

How are 3-d printers useful in studying evolution? a. to color the fossils of organisms b. to create clones of extinct organisms c. to create replicas of fossils d. to prepare paper cutouts of organisms e. to study the composition of fossils

Astudent randomly draws a card from a standard deck and checks to see if it's his favorite suite he then returns the cards to the deck