a sectorial premolar group of answer choices has a single dominant cusp with a sharp edge adapted for cutting. occurs more often in males with large canines. is found in all primates. is found only in humans.

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28-10-2022
Biology

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a sectorial premolar group of answer choices has a single dominant cusp with a sharp edge adapted for cutting. occurs more often in males with large canines. is found in all primates. is found only in humans.

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kumarprabhat kumarprabhat · Answer 1 · 2022-11-02T00:03:09-04:00

In species with massive upper canines, the most anterior lower premolar takes on a unique morphology called a sectorial premolar. Furthermore serving as an hone for the ache-like dog. Premolars having a single dominating cusp and a cutting-edge design are known as sectorial premolars.

Canines of sectorial premolars are sharpened using a "honing" technique. Diastema: void. Particularly in species with particularly large canines, such baboons and gorillas, the enamel surface extends all the way to the root in the premolar sharpener spaces between teeth to receive the projecting canine of the opposing jaw.

The most anterior lower premolar, known as the sectorial, takes on a distinctive shape in species with massive upper canines and serves as an honing mechanism for the canine's scythe-like structure. The first and second premolars are the same size and have two cusps in humans, whose canines are small and unimpressive.

The number of cusps on molar crowns has increased from the original three to four or five in fewer insectivorous species, with four on the upper jaw's molar crown and five on the lower jaw.

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