Question

Which one of the following is hard?

(a)Cotton

(b)Sponge

(c)Iron

(d)None of them.​

Answer 1

Answer:

Iron is the hardest substance form the following above options.

Itz Harsh

Answer 2

(c)Iron is hard is the correct answer

Explanation:

• Cotton: The fibre is almost entirely made up of cellulose, with tiny amounts of waxes, lipids, pectins, and water.
• Sponge: Sponges, which belong to the phylum Porifera, are a sister group to the Diploblasts and are a basic animal clade. They are multicellular animals with a jelly-like mesohyl sandwiched between two thin layers of cells and a body full of holes and channels that allow water to move through them.
• Iron: It is the most abundant element on Earth by mass, just ahead of oxygen, and it makes up much of the planet's outer and inner core.