What are acenders? What are decenders?

Jason needs to learn a new web tool. he went through his books to understand more about it. now he wants hands-on experience with using that tool. what would him? jason can use websites where workspace is provided to test the results of your code.

Michael has written an e-mail to his employees that describes a new product special that will be introduced to the customers next week. by taking time to make sure the e-mail is well written, logical, and organized, michael has made sure his message has the characteristics of a) effective communicationb) ineffective communicationc) barriers to communicationd) workplace communication

Why do we mark tlc plates with pencil and not with pen