The flat Earth<span> model is an archaic conception of the Earth's shape as a plane or disk. </span>
This answer is C Macronutrient
The one that helps identify leaves as monocot or dicot are the characteristic of their veins. In a monocot, leaves have parallel veins or parallel venation; whereas, dicot leaves have a network of veins or reticulate venation. Hope this is the answer that you are looking for. Have a great day!