Te answer is False. T<span>ension and relaxation are mutually exclusive--it is not possible to be relaxed and tense at the same time. R</span>elaxation of the body through decreased muscle tensions will, in turn, decrease mental tension. It is <span>Edmund Jacobson's who showed us Progressive Relaxation Technique.</span>
Their valency is one and both belong to the third period
A 5-carbon base, C,A,G,T are the 5 bases available