How do sand dollar physical qualities improve its life span

sorry but can you explain the question because i didn’t understand it

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sometimes we look at a photo and miss on important information because we don't know all the facts or don't have the complete story behind it. captions give viewers important and relevant information about the photo. most of the time we will look at the photo for a second time after reading the caption under the photo and then find something different or new about it. this visual trip is also known as a loop.

captions differ from descriptions because they're meant to be read by someone else while descriptions contain basic information that will anyone who is working with them.

dr eric sanderson is a character from the book "a world without us". acording to this story dr sanderson's goal is to determine what manhattan island was in the past, before it became a city. sanderson is an ecologist who is interested in the way manhattan looked like in the 17th century.