The book 'Systema Naturae' was written by

You are given leech,Nereis,Scolopendra,prawn,and scorpion; all have a segmented body organization. Will you classify them in one group? If no,give the important characters based on which you will separate these organisms into different groups.

In which group of animals is the coelom filled with blood?

Classify the following organisms into their respective kingdoms as per Whittaker's five kingdom classification:
$Amoeba$,$Euglena$,Birds,Herbs,Cats,$Lactobacillus$.

The phylum in which organisms contain a pseudocoelom is

Give the main features of chordates.