Animals can be classified according to different physical characteristics, such as body covering (e.g., hair, fur, feathers, scales, shells), body shape (e.g., two main features, three main features), appendages (e.g., arms, legs, wings, fins, tails), and method of movement (e.g., walking, crawling, flying, swimming).
<h2>
Iris controls the dilation and constriction of the pupil</h2>
<u>Explanation:</u>
<em>Iris</em> is the part of the eye which is involved in controlling of the working mechanism of the pupil. It is a thin membrane which surrounds pupil. The specialized muscle present in Iris region of the eye are involved in controlling of light entry and its effect on the pupil.
When the light entering the eyes are very bright, it makes the<em> </em><em>iris to constrict</em><em> </em>and which in turn causes the <em>pupil to constrict,</em> whereas when the light entering the eyes is very dim, the<em> </em><em>iris dilates</em> and causes <em>pupil to dilate</em>.
A. the metric system is the most widely adopted
protecting the burned skin so healing can occur is the answer .
A ruler will not be needed due to having a graduated cylinder which can help measure the volume of liquids
