Keisha poked herself with a prickle while picking blackberries. "Ouch!" Keisha exclaimed as she quickly pulled her hand back. No blood appeared.

It was a nice, sunny, summer day and despite the mishap, Keisha had a wonderful time picking. Of course, Keisha ate plenty of blackberries over the next few days. Blackberries are a pretty good source of calcium $($as far as fruit goes$).$ 

Which will ensure that Keisha is able to absorb the calcium she ingests from the blackberries?