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.
This answer explains what a CV2 or CVV2 code is and how it is used. CV2 is an important security feature for credit card transactions on the Internet and over the phone. CVV stands for Card Verification Value. 1  It is the three-digit number printed in the signature space on the back of most credit cards, such as Visa, Mastercard, and Discover cards. 2  The CVV2 number is always the last group of numbers in the signature space on the back of the card.