Excretion

I think you meant to type “excretion” instead of “excertion”. Excretion is the process by which organisms expel metabolic waste products and other toxic substances from their body¹. Exertion is the physical or perceived use of energy, especially a strenuous or costly effort³. They are different words with different meanings. I hope this helps you. 😊.

(1) Excretion | Definition, Systems, Examples, Importance, & Facts. https://www.britannica.com/science/excretion.
(2) Exertion – Wikipedia. https://en.wikipedia.org/wiki/Exertion.
(3) Excretion Definition – Discover the Meaning of Excretion – BYJU’S. https://byjus.com/biology/excretion-definition/.
(4) Exertion Definition & Meaning | Dictionary.com. https://www.dictionary.com/browse/exertion.
(5) Exertion – definition of exertion by The Free Dictionary. https://www.thefreedictionary.com/exertion.
(6) Getty Images. https://www.gettyimages.com/detail/illustration/sitting-for-get-proper-degree-angle-for-help-royalty-free-illustration/692955414.