WHY DOES THE SMALL CUT ON MY FINGER MAKE MY WHOLE HAND HUR??!! T^T i cut myself on the tip of my ring finger and I don't even know how. T^T

The authors use the word “backbone” in lines 3 and 39 to indicate that

When looking at research about instructional strategies, make sure the research is a. from peer-reviewed studies. b. approved by state and federal government organizations. c. online and easily accessible. d. about the same topic you're interested in.

Which labels do x and y represent? x: scattered bundles y: multiples of four or five x: scattered bundles y: multiples of three x: bundles in a ring y: multiples of four or five x: bundles in a ring y: multiples of three