The articulation between the periodontal ligament and the bone at the base of the tooth is what type of joint? the articulation between the periodontal ligament and the bone at the base of the tooth is what type of joint? symphysis gomphosis syndesmosis synostosis suture

Fibrous joints these are joints that is characterize with no joint cavity which is connected through fibrous connective tissue.

One of the example of these connective tissues is Sutures, which these are the joints connecting the bones in the skull. In fetal skulls the sutures are wide to allow slight movement during birth. They later become rigid (synarthrodial). And the  Gomphosis is a joint between the root of a tooth and the socket in the maxilla or mandible (jawbones)

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.