Question

Which one one of the following is true for the elements Copper, Zinc and Iron?
1)Copper can displace the other two from their solution
2)Iron can displace the other two from their solution
3)Zinc can displace the other two from their solution
4)Each of these three elements can displace the other two from their solution

Answer 1

AnswerAll are true

I think

Explanation:

Answer 2

Iris, in anatomy, the pigmented muscular curtain near the front of the eye, between the cornea and the lens, that is perforated by an opening called the pupil. The iris is located in front of the lens and ciliary body and behind the cornea. ... The amount of pigment contained in the iris determines eye colour.