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Ileum, caecum and colon of rabbit, showing Appendix vermiformis on fully functional caecum The human vermiform appendix on the vestigial caecum. The appendix was once believed to be a vestige of a redundant organ that in ancestral species had digestive functions, much as it still does in extant species in which intestinal flora hydrolyze cellulose and similar indigestible plant materials. [10]
Past research suggests that live insects represent at least 14% of foreign objects found in people's ear canals. Other commonly identified objects include cotton balls, beads and earring backings.
The evolution of the mammalian middle ear appears to have occurred in two steps. A partial middle ear formed by the departure of postdentary bones from the dentary, and happened independently in the ancestors of monotremes and therians. The second step was the transition to a definite mammalian middle ear, and evolved independently at least ...
An otolith (Ancient Greek: ὠτο-, ōto-ear + λῐ́θος, líthos, a stone), also called otoconium, statolith, or statoconium, is a calcium carbonate structure in the saccule or utricle of the inner ear, specifically in the vestibular system of vertebrates. The saccule and utricle, in turn, together make the otolith organs.
Why some people have a small hole in front of their upper ears. Kelsey Weekman. November 29, 2016 at 2:33 PM. There is a birth defect of the ear that is visible and relatively common around the world.
A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste. Some very simple animals may not have a head, but many bilaterally symmetric forms do, regardless of size.
While keeping a big cat as a pet may look ‘cool’ online, in reality, it poses a danger to both people and animals." Image credits: Nature Photographer of the Year (NPOTY) 2024
At the posterior end is a tail which continues the spinal cord and vertebrae but not the gut. The mouth is found at the anterior end of the animal, and the anus at the base of the tail. [28] The defining characteristic of a vertebrate is the vertebral column, formed in the development of the segmented series of vertebrae.