Brain › Science & NatureThe element involved in making human blood red is which of the following?IronCopperIridiumCobaltAnswerThe correct answer is A) Iron.More Science & Nature questionsWhich of the following blood vessels carries deoxygenated blood?What is the common name of the chemical compound "dihydrogen monoxide"?How many bones are in the human body?Which gas forms about 78% of the Earth’s atmosphere?Which of these bones is hardest to break?What does LASER stand for?Play Brain · Practice