melanin

"The bird ruffled its feathers to stay warm on the cold morning. "

"While walking to school, Sarah found a lost wallet on the ground. "

"Although he was unused to the situation, he tried to act naturally."

"The liftoff will occur in exactly twelve seconds."

"The carrot's orange color comes from a pigment called carotene. "

"They brought their books with them."

"My sister is very helpful, especially when it comes to organizing things. "

"There were so many people at the restaurant last night."

"The colors of autumn leaves come from different pigments in the tree cells as the green chlorophyll fades. "

"The group of students worked together on their project. "

"I sunburned myself playing tennis yesterday. "

"The likely winner of the science fair is Sarah, judging by her impressive project. "