Which of the following organisms is an invertebrate?
Earthworm is an invertebrate.
Earthworms belong to the phylum Annelida and are characterized by the absence of a backbone, which classifies them as invertebrates. Unlike vertebrates, invertebrates do not possess a spinal column, making earthworms a prime example of this category of organisms.
Dogs are mammals and classified within the phylum Chordata, which includes all vertebrates. They possess a backbone and a complex skeletal structure, distinguishing them clearly from invertebrates. This vertebrate classification is fundamental to their physiological and anatomical characteristics.
Fish are also vertebrates and belong to various classes within the phylum Chordata. They have a backbone, gills, and typically fins for swimming. This vertebrate classification makes fish distinct from invertebrates, as they share the common structural feature of a spinal column.
Snakes are reptiles that fall under the phylum Chordata, making them vertebrates. Like dogs and fish, snakes possess a backbone and are part of the larger group of animals with vertebral columns. This characteristic is a defining feature that separates them from invertebrates.
As previously mentioned, earthworms are invertebrates from the phylum Annelida. They do not have a vertebral column, which is the defining trait of invertebrates. Their body structure and classification make them an essential example of this group of organisms.
Invertebrates, such as earthworms, are organisms lacking a backbone, which is a key distinction from vertebrates like dogs, fish, and snakes. The earthworm's classification within Annelida underscores its invertebrate status, while the other choices exemplify vertebrate characteristics that clearly separate them from invertebrate organisms. Understanding these classifications is crucial in the study of animal biology and ecology.
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