Chest straps, I did this before and got it right, trust me. :)
The correct answer is; True
Protein can be found in both animals and vegetables.
Protein is one of the three major macronutrients that is important to building muscle mass. Protein is commonly found in animal derived foods and some vegetables. Animal protein sources (such as meat, eggs and fish) are known to be complete sources of protein because they have all the essential amino acids that the body requires, while plant protein sources (such as nuts and beans) are known to be incomplete sources of protein because they do not possess one or more of the essential amino acids.
C. Excretion
Excretion is part of the excretory and really has nothing to do with the respitory system which deals with gas exchange.
Answer:
D. Middle Class
Explanation:
because most people are middle class so it's the "norm"
