Which substance is constantly processed by some exploring organs even though it is not excreted by the excretory system

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

Imagine you are introducing the lac operan and the trp operon to students who have never learned about it before. complete the table to compare the similarities and differences between the two operons