A plant makes its own food in its leaves . Water comes to the leaves through the roots . Air gets into the leaves through very small holes . The green coloring in the leaves uses the water and air to make the food for the plant . It also needs sunshine because a plant can make food only when the sun is shining.
   Animals and people could not live without green plants . They both eat plants . People and some animals also eat the meat of some animals and these animals eat plant

-- Would you like to play football after school?  

-- ________. I have a lot of homework to do.

已知y=（m﹣2） $x^{m^2-m}$+3x+6是二次函数，则m=____ ，顶点坐标是____ ．