How did the sinking of the Lusitania and the Zimmerman note both play a role in the us entering WW1?

The American public was already shocked and horrified from the sinking of the Lusitania and the constant attacks on their ships, The Zimmerman note was the last straw since it finally turned the publics opinions from anti-war to pro-war.

c.) biotic: snails; abiotic: temperature climate

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.