- Why is there a sequential progression of species during succession?

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How do you find the other mass in an elastic equation if you only know one mass? I need help w/ a complicated Pythagorean Theorem prob.This box won't allow me to put the whole question but I can comment it. Help please!? What is the reference angle of -1.7 degrees? What is the length of the hypotenuse here? (3) (5 pts) Give a two-column proof of the following deduction:
M ⇒ (N ∨ P), ∴ (M & ¬N) ⇒ (P & ¬N)?