answer this I will make you as brainlilist
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Answer:
Q15
1.vibrational 2.periodic 3. periodic
Q16
A skull, or cranium, is a set of bones that make up the head of a vertebrate and keep in place all body parts in the head. It supports the structures of the face and forms a protective cavity for the brain.
As well as protecting the brain, the skull fixes the distance between the eyes and between the ears. This allows stereoscopic vision, and helps help the brain judge direction and distance of sounds. In some animals, the skull also has a defensive function (e.g. horned ungulates). The frontal bone is where horns are mounted. The skull is made of a number of joined (fused) flat bones. In humans, the adult skull is normally made up of 28 bones.
Q17
1. personal error
2.Measurement unit obtained by multiplying a given measurement unit by an integer greater than one. The SI prefixes for multiples of units are: Factor. Name.