Answer:
When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.
Maybe a lender like if someone lends an eraser
When we say firsthand and personal source, this would mean that the answers that you are looking for should come directly from the person him or herself who is involved in a particular issue or event. In this case, it is the diary entry that could be considered as a first hand source for a historical event. The diary is directly written by the person him or herself.
It is considered a secondary resource, because while she was there, she may have been too young to recount all events truthfully, and may either leave out some key moments or accidently add things that shouldn't be in there
hope this helps
