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Option 1 : Protozoa
The correct answer is Protozoa.
- Protozoa were defined as single-celled animals or organisms.
- The term protozoa are now mostly used for single-celled, non-photosynthetic protists (like amoebae, ciliates, and flagellates).
- They are microscopic organisms of size 10 to 52 micrometers.
- Anthropods- With about nine lakh types, Arthropoda is the largest phylum. They can be marine, parasitic or even terrestrial.
- They have appendages fused together and a chitinous exoskeleton.
- This phylum comprises many broad classes and includes the Insecta class, which represents a substantial portion of the world's animal species. In any habitat, they have the capacity to thrive.
- Echinoderms- Echinoderms are a wide group of marine animals only (scientific name Echinodermata).
- The name comes from the word for spiny skin in Greek.
- From the intertidal zone to the ocean depths, there are about 7,000 species normally found on the sea floor in any marine habitat.
- They've got a wide range of colours.
- Annelids- Annelids are a phylum of worms made from invertebrates.
- Earthworms and leeches are well known species.
- In most wet conditions, annelids can be found.
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