How many stars are in our 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?

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

The sr-71 blackbird jet has a mass of 30600 kg and a top speed of 981 m/s. what is it’s maximum kinetic energy