where its free (unbound) concentration is lower
Answer: Option A) Oxygen may not have been able to accumulate in the atmosphere
Explanation:
Ozone, O3, is an allotrope of oxygen having three atoms in the molecule instead of the usual two present in molecular oxygen. Ozone is generated from oxygen, and is the only form in which oxygen can exist in the atmosphere.
The correct answer is A) DNA
Answer:
If this is actually a question, a suit of armor would be a good analogy for the function of the skeletal system because they both protect you.
Explanation:
