An endosystem is a biological system or environment that exists within another system, often referring to the internal ecosystem of an organism. This concept can encompass various symbiotic relationships, such as those between host organisms and their internal microbiota, which play crucial roles in digestion, immunity, and overall health. Understanding endosystems helps researchers explore the complex interactions that influence both individual organisms and broader ecological dynamics.
There is a special reason that flatworms are flat. Because of their flatness the area of their 'body' is bigger (so a bigger surface area). Through this characteristic, they are able to diffuse more in and out of their endosystem.
Oh, dude, a meerkat has like around 270 bones in its body. I mean, who's counting, right? They're probably just chilling in the desert, not worried about how many bones they have. But hey, if you ever need to know for a meerkat anatomy test, now you're covered.