Most of the people find it difficult to differentiate a frog from a toad. They normally mix them up. Although they seem so similar in appearance, they certainly have numerous dissimilarities too.
Frogs are found in many different shapes, sizes, colors, and textures. Frogs have smooth, wet skin. They live most of the time in or near water. They have different eye colors including brown, silver, green, gold and red along with different shapes and sizes of pupil. Some of the frogs have sticky padding on their feet while others have webbed feet. It is obvious that not even all the frogs have same qualities.
Although this sentence has a contrast transition , the criteria for contrasting are not the same. The criteria used for Aaron are height (tall) and strength (strong). We would expect similar criteria to be used for Bruce (maybe he is short and weak), but instead we have new criteria, namely appearance (handsome) and intelligence (intelligent). This is a common mistake for students when writing this type of paragraph or essay. Compare the following, which has much clearer criteria (contrast structure words shown in bold).