Unlike arrays, slices are _____ in size and values can be appended to them using the append function.

Unlike arrays, slices in Go are dynamic in size, which means you can change the length of a slice as needed. You can append values to a slice using the append function, which allocates a new underlying array if necessary to accommodate the new elements. This dynamic behavior and the append function make slices a versatile choice for working with collections of data in Go.