Answer:
The second option is the correct answer
Step-by-step explanation:
Unicellular means
UNI = one CELLULAR= has cell(s)
this must mean that the organism has one cell. And we know that plants have multiple structures, so they must have multiple cells! This also applies to animals, they have more than 1 cell, because of their many structures. So this ELIMINATES unicellular.
Vertebrates, are animals that HAVE backbones. And we know that plants DO NOT have backbones, but animals do. This question is asking about PLANTS AND ANIMALS so this ELIMINATES vertebrates.
So this means that the answer is multi-cellular