Sometimes if you read a series out of order, you are fine, others you get lost. Thankfully these three titles, when read out of order, were not too difficult to follow for me as an adult. And in fact, even kid readers wouldn’t be too put off by out of order reading. However, I do recommend reading in the order the author meant for you to read them.
Yet, had I read Mystery at the Aquarium (Volume 1) (OceanX Adventures) by Kate B. Jerome before reading book two, I do not think I would have gone onto book two. This first fun adventure with our friend Marena and her “crew” (her best friend and Marena’s older brother, plus the people she meets along the way) asking questions, learning the facts and solving the mystery, was not very strong. I think as we were tossed into an adventure on the (and in the) ocean in book two, things were high expectations for me. Not to say book one’s mystery was not entertaining (why the electricity only cuts out at night), but it did not have the same “energy” as having a submersible rocking on the edge of the abyss. Still, I enjoy this series, especially when tying in the real OceanX facts and studies. But I probably won’t be reading book three. 
While with the series Animal Rescue Friends (Volume 1) by Gina Loveless, Meika Hashimoto, Genevieve Kote I was glad I read them out of order,
as I know I would not have moved onto the other two. This graphic novel series has cute stories for kids who like animals. Maybe they are a bit idealistic, but for the six to ten age group they are perfect. Each volume is connected, but each is also a stand alone read. The short chapters are each their own story, and are fun, with clever art. The illustrations are familiar and cozy. Not overly detailed but not under detailed wither. Things are “shiny” and simple. Volume one has extras you do not have in the other two, about the authors, illustrators, and graphic novel making.
And a quick note on Animal Rescue Friends: Friends Fur-Ever: Volume 2 by Jana Tropper, Genevieve Kote and Axelle Lenoir. Perhaps this volume is my favorite of the three I have read, but there was a question I had about the porcupine story. The fact that the “know it all” character believes a falsehood about them, and the “bully know it all” is the one who corrects her was great, but I really wish they had pushed harder to not have the kids try and wrangle the animal into their backpack, as even this country girl knows you don’t mess with a PO’d porcupine! If you like the series PAWS by Nathan Fairbairn Animal Rescue Friends is another good series to read.