Which one is the most striking or common character of the vertebrates?

The book 'Systema Naturae' was written by

The animals having a two-chambered heart belong to the class:

Give reasons:
$(a)$ Animals of phylum Platyhelminthes are called flatworms.
$(b)$ Bryophytes are called amphibians of the plant kingdom.
$(c)$ Fungi are called saprophytes.
$(d)$ Bacteria and tapeworms are very different in their body design.
$(e)$ Plants like Pinus and deodar are called gymnosperms.

Which of the following is not a criterion for the classification of living organisms?

What is the difference between algae and fungi?