The animals having a blood-filled coelomic cavity belong to which phylum?

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

Draw a diagram of $Euglena$ and label the following parts:
Flagellum,photoreceptor,eyespot,chloroplast,nucleus,contractile vacuole.

Identify the phylum for the following characteristics given:
$(a)$ Organisms with jointed appendages.
$(b)$ Organisms are generally flatworms.
$(c)$ Body is segmented.
$(d)$ Skin of organisms is full of spikes.

Label $X$ and $Y$ in the given diagram of Hydra.

List the basic criteria for classifying the Plantae kingdom into various groups. Identify the following specimen given in the image and write its characteristic features.