'Not iron but this reddish-brown element catalyzes the formation of hemoglobin in humans'
copper
WHATEVER!: Not iron but this reddish-brown element catalyzes the formation of hemoglobin in humans
Not iron but this reddish-brown element catalyzes the formation of hemoglobin in humans
Not iron but this reddish-brown element catalyzes the formation of hemoglobin in humans
WHATEVER!
copper
WHATEVER!