Refer to the figure showing the digestive systems of an earthworm and a cockroach. 
Which component of the digestive system is found in only one of the organisms in the figure?
Definitions:
Marginal Revenue
The additional income received from selling one more unit of a good or service; it's a critical concept in determining optimal output level.
Prices
The cost in terms of money expected, required, or given for acquiring something.
Marginal Revenue
The extra revenue a company earns by selling an additional unit of a product or service.
Prices
The cash amount one needs to spend to obtain a good, service, or asset.
Q17: Which statement about osmosis is false?<br>A) The
Q59: The nitrogenous waste _, which is less
Q66: The P wave of an electrocardiogram recording
Q73: Carbonic anhydrase is an enzyme in red
Q86: Which type of food is least likely
Q103: Which pairing between region of the vertebrate
Q135: A malnourished patient in late-stage anorexia is
Q152: Which statement about the kidneys' role in
Q200: Which feature does not characterize aquaporins?<br>A) They
Q213: Linoleic acid is a(n) _ needed to