Please help me
Describe the roles these organisms play in their ecosystem.

Are aliens real? justify you’re answer.

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease