Which type of ladder is a general purpose ladder and consists of two or more sections that travel in guides or brackets, allowing adjustable lengths? a. extension ladder b. platfrom ladder c. step ladder d. straight ladder e. two-way ladder

99.99% Sure that the answer is A. Extension ladder. 

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Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.