Which of the following is true about mutation?

a. Mutation comes from artificial selection.

b. Mutation is always harmful to an organism’s survival.

c. Mutation is always helpful to an organism’s survival.

d. Mutation can come from environmental changes

PLZ HELP ME!

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

cell division is not regulated in tumor cells.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully