Please give me the correct answer

Present time is part of the mesozoic era. question 7 options: true false

Anew organism has been discovered. this organism has a bilaterally symmetric unsegmented body. it's capable of moving on its own with a muscular appendage and is encased in a large shell that seems to be attached to its body. based on this evidence, which phylum would this new animal likely be classified into? a. arthropoda b. echinodermata c. nematoda d. mollusca

Where is transcription located? (assuming eukaryote cell)