[Answer] What are Protozoa and how are they structured?

Answer: Single-celled parasites; mostly free-living (not intracellular), produce
through sexual or aesexual reproduction
What are Protozoa and how are they structured?
Structure. Protozoa are microscopic unicellular eukaryotes that have a relatively complex internal structure and carry out complex metabolic activities. Some protozoa have structures for propulsion or other types of movement.
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Protozoa is a single cell animal that we can find in every possible habitat on earth. Furthermore the scientist has described more than 50 thousand species of Protozoa. Moreover they are herbivores carnivores and omnivores. Also they exist on earth from the Pre-Cambrian era and scientists find their remains in the fossil record of that time.
Protozoa are single celled organisms. They come in many different shapes and sizes ranging from an Amoeba which can change its shape to Paramecium with its fixed shape and complex structure. They live in a wide variety of moist habitats including fresh water marine environments and the soil. Some are parasitic which means they live in other plants and animals including humans where they cause disease. Plasmodium for example causes malaria. They are motile and can move by:
Protozoa is a phylum having unicellular heterotrophs. It comes under Kingdom Protista. Protozoa are divided into four major groups based on the …

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