Which of the following is a key characteristic of metaphase? Possible Answers:
DNA replicates and there are two copies of each chromosome
The chromosomes move to a narrow central zone of the cell
Chromosomes coil so tightly that they become visible at individual structures
Nuclear membranes form and the chromosomes gradually uncoil
Chromosomes separate and move toward opposite ends of the cell

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? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.