Question

What metal, which rusts easily, and is used to make steel, is found in hemoglobin, a compound that carries oxygen in our blood?

Answer 1

Iron or ferrum

Explanation:

Iron is the answer.

The most abundant of all metals, its pure form rapidly corrodes from exposure to humidity in air and high temperatures. Iron is also the fourth most common element in Earth's crust by weight and much of Earth's core is thought to be composed of iron. Besides being commonly found on Earth, it is also abundant in the sun and stars, according to the Los Alamos National Laboratory. Iron is crucial to the survival of living creatures, according to Jefferson Lab. In plants, it plays a role in the production of chlorophyll. In animals, it is a component of hemoglobin — a protein in blood that carries oxygen from the lungs to the tissues in the body.

Reference:
https://www.livescience.com/29263-iron.html