What does the word species mean in latin?

Why did thales choose water as the "primeval stuff", what us this "primeval stuff"

47. a student is frightened by a loud noise, which results in a hormone being released into the blood. the hormone causes the student's heart to beat rapidly. the two systems that work together to cause this reaction are the endo- crine system that secretes the hormone and the (1) nervous system (3) excretory system (2) reproductive system (4) digestive system

Does any one here play destiny 2? so that this question doesnt get deleted oo, what is pi r ^2 of the circumference 0of 5