From a document by chemical, abrasive, or other means. Which answer is Erasures are a type of alteration where material has been from a document by chemical, abrasive, or other means. which answer is best?

erased

removed

rewritten

none of the above

Pinene is an unsaturated hydrocarbon found in pine resin. if pinene has m+ = 136 and contains 1 double bond(s) and 2 ring(s); what is its molecular formula? enter the formula in the form ch first, then all other atoms in alphabetical order; do not use subscripts. the formula is case-sensitive