Astudent obtained 1.69 g of pure caffeine following recrystallization from a crude sample, which originally weighed 2.51 g. what is the percent recovery of pure caffeine from crude?

Which is a character of nuclear fusion but not nuclear fission

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?