Help PZLLLZLZ Z ZZZ ZZ

5. to comply with implementation requirements, shops must ensure that paint booth exhaust systems use efficient spray booth filters. a) 75% b) 100% c) 50% d) 98%

How do you work out 21.3-8= show your working. plz

How are 3-d printers useful in studying evolution? a. to color the fossils of organisms b. to create clones of extinct organisms c. to create replicas of fossils d. to prepare paper cutouts of organisms e. to study the composition of fossils