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Name a class of annelids whose members may have protonephridia? Verify that M(u,v)=A +u(B-A) +v(C -A) ( A,B,C vectors) is a parametric representation of surface of the triangle A(1,0,0) B(0,-1,2) C(0,2,1)? What set of reaction conditions would favor an SN2 reaction of 2-bromo-bromo-3-mehthylbutane? Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4? A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval?