Give any one difference between each of the following.
A. Protozoa and Metazoa.
B. Invertebrates and Vertebrates.
C. Insects and Arachnids.
D. Flatworms and Roundworms.

Hint: To The key distinction between Protozoa and Metazoa, Amoebae, flagellates, ciliates, and Sporozoa are the main forms of protozoan, while vertebrates and invertebrates are the two main forms of metazoan. Invertebrates don’t have a backbone or an inner skeleton. The frame of an arachnid is made from segments: the cephalothorax and abdomen. Whereas there are greater than 25,000 species within the flatworm phylum. Some are simplest, approximately a millimeter in length. Roundworms are invertebrates of Phylum Nematoda.

Complete answer:
Part (A) - Difference between protozoa and metazoa:

 Part (B) - Difference between Invertebrates and vertebrates:

Part (C) - Difference between insects and Arachnids:

Part (D) - Difference between flatworms and roundworms:


Note: Protozoa and Metazoa are two groups of eukaryotic animals that are categorized according to their organization of the body. While Sponges, corals, worms, insects, spiders, and crabs are all sub-businesses of the invertebrate group – they now no longer have a backbone. Fish, reptiles, birds, amphibians, and mammals are one of a kind sub-businesses of vertebrates. Arachnids are creatures with frame segments, 8 legs, no wings or antennae, and aren’t capable of chew. While flatworms generally live in water areas whereas roundworms can live either in water or soil’s side. However, roundworms are extra superior to flatworms. They additionally have blood vessels.