What punctuation mark is missing from this use of a direct quote? According to Dr. Leon “tree rings are a tree’s timepiece.”

a dash after to
a period after Dr. Leon
a comma after according
a comma after Dr. Leon

During sensitive periods of brain development like cell migration the brain is vulnerable to effects like: a. malnutrition b. infection c. toxins /drug use d. b and c e. all of the above

Bailey enjoys working with her hands. she wants to choose a career path that would allow her to create things. which career would be best for her? a. zoologist b. greenhouse nursery worker c. energy auditor d. civil engineer e. jeweler and metal worker

On what political idea did president truman base the marshall plan? as economic aid increased in europe, the friendship of nations with the united states would increase. as peace throughout the world increased, the threat of another world war would decrease. as prosperity in europe increased, the threat of communism spreading would decrease. as the power of capitalism increased in europe, stalin's power in the soviet union would decrease.