What is the function and origin of silk and spinnerets in spiders?RT用英语回答问题。

what is the social function of the language what is the function of the first paragraph什么意思 what is the function of the reception area? what is the function of [peptidoglycan of a eubacteria] What is the function of mood in writing fiction What is the basic function of paging关于计算机的 What is the function of a Durham tube? what is the function of the air to the things in the sky?什么意思 what is the mean of function ?I want to know something about function in c++,and how to use it in programming !especially in function overload!help! What is the major function of the OPEC?请用英语, several values of the function f are shown. the function g is defined by g(x)=f(3x+1).what is the value of g(2) What is the function of music in daily life 求长文章 what is the function of Stream of Consciousness 意识流的写作手法有什么作用? what is the value of the discriminant for the function f(x)=8x^2+13x+7? what is the image of the function f:R->R,f|x|+x?use the interval notation What is the slope of the line whose function f satisfies f(-2)=1 and f(5)=-10? A portion of the graph of the function f is shown in the xy-plane above. What is the y-intercept ofthe graph of the function g defined by g(x)=f(x)+1? what are the coordinates of the holes in the function