The following statements were thought to be correct in the nineteenth century. Which of them are now known to be incorrect? 

For those that are incorrect, indicate why the statement is wrong and modify it to be in accordance with modern views. 

(a) Energy can be neither created nor destroyed. 

(b) The acceleration of an object is proportional to the force applied to it and inversely proportional to its mass. 

(c) Atoms are indivisible and indestructible. 

(d) All atoms of a particular element are identical.