What links the 2 sister chromatids?

The sister chromatids are held together by proteins at a region of the chromosome called the centromere

Explanation:

A Common Centromere

Explanation:

Two sister chromatids are linked by a common centromere. They separate during either mitosis or the second division of meiosis.

this transfer is call conjunction

about 40,000,000 results (0.81 seconds)  

search results

what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.