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Monophyletic organisms are those that are derived from a single ancestor. However, the descendants of the same ancestor do not look alike because they are diverged due to mutations and adaptations. The adaptations depend upon climatic and environmental factors.

Bettles are considered a monophyletic group because they have a common ancestor, unlike other organisms. These organisms can also be called clade because when the phylogenetic tree is made, they have a single branching and not multiple.

However, adaptations and variations caused the animals to look different from one another.

Invertebrate organisms are considered polyphyletic groups because these organisms do not have a common ancestor like vertebrate organisms. When these organisms are placed in a phylogenetic tree, they exhibit multiple branching because they evolved from different ancestors.

Hence it clearly denotes that these organisms are unrelated to one another and do not possess any common ancestor currently or in the past. Such organisms are hence placed under the polyphyletic group.

Invertebrates are organisms that are less complex when compared to vertebrates. They evolved from pre-existing forms that did not have tissues or organs in the body. To cope with the demand, these organisms developed tissues and organs.