The-Living-World Question 785
Question: Which of the following is a trace element required only in small amounts by most living things
Options:
A) Oxygen
B) Iron
C) Nitrogen
D) Hydrogen
Show Answer
Answer:
Correct Answer: B
Solution:
Iron is component of haemoglobin of RBC of blood and helps in transportation of oxygen (about 97-99%) as well as carbon dioxide (about 23%).
BETA
