Choose the system to which this item belongs:

villi

excretory
circulatory
endocrine
digestive
respiratory

Alocal reaction will occur at the site of the exposure such as irritation or damage to the skin eye or local reaction will occur at the site of the exposure such as irritation or damage to the skin ireland lounges

What are "open-loop" and "closed-loop" systems

Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.