Which division among plants has the simplest organisms?

In which kingdom will you place an organism which is single-celled,eukaryotic,and photosynthetic?

In the hierarchy of classification,which grouping will have the smallest number of organisms with maximum common characteristics and which will have the largest number of organisms?

What are the differences between amphibians and reptiles?

Explain the basis for grouping organisms into five kingdoms.

How are pteridophytes different from the phanerogams?