1.) Lesly argues that an organism called a Euglena is a plant because it is eukaryotic, has a nucleus, makes its own food, and is unicellular. Where is Leslie's error? Plants do not make their own food.
Plants are multicellular.
Plants are prokaryotic.
Plants do not have a nucleus.

2.) Why are emperor penguins considered a species?

They all look alike.
They can mate and produce offspring that can mate.
They can mate and produce offspring that cannot mate.
They all walk in a similar manner.

3.) Neurons are brain cells. Where could a new neuron come from?

lysosome
chloroplast
Golgy body
nucleus