Yes, because it's a picture taken of the event.
You know a secondary source is something that DID NOT take part of or witness the event, so a Primary source is something that DID take part of, or witness the event.
So a picture would be a Primary source.
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Answer
Chronically aging
Chronically aging is considered to be the most important determinant of someone’s age.
Well, one example would be a hare. In winter, they change by growing a big, fur coat to keep them warm.
Another great example would be ducks and/or chickens. When winter is approaching, they shed their old feathers (also known as "molting") and grow a new, thicker layer of feathers to keep warm. I know this from experience, because I have 2 ducks and some chickens of my own. =)
Hope this helps! ^_^
