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7 min read 
Vertebrates and Invertebrates are the two categories into which all the species of animals are classified. Animals are heterotrophic, multicellular organisms that are classified within the kingdom known as Animalia. The primary distinction between vertebrates and invertebrates lies in the fact that vertebrates comprise of a backbone while invertebrates don’t have an internal backbone.
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d arterial blood vessels are the two kinds of blood vessels that are part of the closed circulatory system. The primary purpose that blood vessels serve is move circulation of blood around the entire body. However, veins and arteries differ in design and purpose.
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Primary succession can be described as a kind of eco-succession that occurs in an area that is new and has no suitable soil, and is first colonized with living creatures.
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Passive and active transport are two different methods to move molecules across cells’ membranes. The cell membrane is multi-tasking device that provides structure to the cell , while protecting the contents of the cytosol from the outside environment.
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An autotroph is one of the groups of organisms that can produce their own food using diverse substances like sunlight, water and various other chemical compounds.
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Phenotype is a term that is used in genetics to describe all traits that can be observed in living organisms that result of interactions of the genotype and the environment.
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Voluntary muscles are muscles that are movable by at the discretion of a person . They are usually connected to the skeleton system.
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Vascular plants, often referred to as tracheophytes, are the plants on the land with cells that are lignified to conduct minerals and water all over the body.
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The rough and smooth ERs are the two kinds of endoplasmic-reticulum that form an interconnected system made up of membrane-bound channels that are located in the cell’s cytoplasm. ER is an organelle that is enclosed by membranes found only in the eukaryotic cell.
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Cilia and Flagella are tiny structures attached to eukaryotic and prokaryotic cells. They protrude from the surface of their cells. These structures help in the locomotion of unicellular organisms. Accordingly, they mainly contain proteins called microtubules or basal bodies. In the case of single-celled eukaryotic organisms, both cilia and flagella are vital for locomotion.