Astudent creates a model of a closed ecosystem by filling a glass tank half full with water then adding 10 snails and two small aquatic plants the next day all the snails are dead what is the most likely cause of their death

The reason why the snails are dead because the snails lack oxygen for it is a model of closed ecosystem. Another reason to this is that they lack  abiotic factors that they need in surviving or as they live for the place that they are living lacks a lot and are not enough for them to last or survive. Lastly, the water could have not been a contributor for them to live for they may not be able to live in a water environment and could only dwell in land.

Iwould say a is accurate

Iwould have to say sorry i can't elaborate more. hope this though!