In this unit, you used this code to ensure that the user would enter a number and not letters: while True:

try:

num = int(input("Enter your age: "))

break

except ValueError:

print("That's not a number!")

How could you modify this code to be sure that the user enters a positive number?

Which best describes the role or restriction enzymes in the analysis of edna a. to break dna into fragments that vary in size so they can be sorted and analyzed b. to amplify small amounts of dna and generate large amounts of dna for analysis c. to purify samples of dna obtained from the environment so they can be analyzed d. to sort different sizes of dna fragments into a banding pattern that can be analyzed

The place where the extended axis of the earth would touch the celestial sphere is called the celestial

The option enables you to modify a slide element in most presentation applications.