Final answer:
The wrinkles in the CMBR are caused by turbulence and density fluctuations. The observed temperature variations are greater than originally expected.
Step-by-step explanation:
The wrinkles in the Cosmic Microwave Background Radiation (CMBR) are caused by two main factors: turbulence in the early universe and the fluctuations in density. Turbulence leads to the formation of hot and cool spots in the CMBR, while density fluctuations cause regions of high and low density, resulting in temperature variations. These temperature variations are observed to be greater than originally expected, indicating that the CMBR is not perfectly smooth but has small differences in temperature.