Some doubted that Sacco and Vanzetti received fair trials because they were: A Communists
.
B. poor

C. Republicans

D. immigrants

D, immigrants

Explanation:

They were Italian immigrants and radical militant anarchists, and feelings were charged in the community toward these groups.

Nicola Sacco and Bartolomeo Vanzetti, Italian immigrants and anarchists, were executed for murder by the state of Massachusetts in 1927 on the basis of doubtful ballistics evidence and were executed by electric chair, August 23, 1927. During their trials Witness testimony was ignored. They were found guilty even though another man, Celestino Maderios confessed to the murders.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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c.) biotic: snails; abiotic: temperature climate