an animal requires a mate to fertilize an egg & coloration is used to find a mate by some animals ->  coloration can can be used by an animal find a mate to fertilize an egg  coloration can can be used by an animal find a mate to fertilize an egg & if something can be used for a process then that something can have a positive impact on that process ->  coloration can have a positive impact on an animal's ability to fertilize an egg  coloration can have a positive impact on an animal's ability to fertilize an egg & animals require fertilization to reproduce ->  coloration can have a positive impact on an animal's ability to reproduce  coloration can have a positive impact on an animal's ability to reproduce & an adaptation has a positive impact on an animal 's ability to reproduce ->  coloration is an adaptation for reproduction for animals  brook trout have bright orange bellies & having an orange belly is a kind of coloration ->  brook trout have a bright orange coloration on their bellies  coloration is an adaptation for reproduction for animals & brook trout have a bright orange coloration on their bellies ->  bright orange bellies are an adaptation for reproduction for brook trout  bright orange bellies are an adaptation for reproduction for brook trout & adaptation is when an organism develops a trait over time for survival -> brook trout developed bright orange bellies over time to help them reproduce