Roundworms have taken this last body plan and adapted to thousands of environments with it. From microscopic to maybe a meter long, roundworms are just what they sound like-round worms. At one end, they have a mouth, at the other, an anus, with a tube digestive system in between.
Availability of two-factor authentication for Apple ID Two-factor authentication is an extra layer of security for your Apple ID designed to ensure that you're the only person who can access your account, even if someone knows your password.
tumblr. Jim Kerstetter/CNET. Microsoft has offered two-step verification (2FA) process since early 2013. Also known as two-factor authentication or two-step authentication, the process strengthens your account security by requiring you to enter your password (step 1), then a security code (step 2).tep 2: Click on the Set up two-step verification link. Step 3: Follow the setup process until you reach the end, then click Done.. You may be asked to provide a verification code, sent to either your phone via SMS or to your alternate email address, before you can complete the two-step setup.