How is the grouping of states in a constellation different from the grouping of planets in the solar system?

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?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

What are two different ways you could find the value of a? explain these methods.