When it is in the hollow cell, the hollow cell takes the food and propels it into little tubes, which are lined with flame cells. These flame cells contain small cilia, these cilia pushes the waste from the flame cells to tubules that excrete the waste from the proglottids.
Attachment size limit. You can send up to 25 MB in attachments. If you have more than one attachment, they can't add up to more than 25 MB. If your file is greater than 25 MB, Gmail automatically adds a Google Drive link in the email instead of including it as an attachment. The person you send the file to can download it so they'll have access to it even if you remove it from Google Drive.
Currently, on May 9, 2012, users of the free Hotmail email service are able to add files that are up to 25 MB in size. Note that this does not mean that you can add multiple 25 MB files to one email message and send email messages that are hundreds of MB in size. You must also take into consideration the size of the message that you are sending with the attachment.