Many products and services were initially developed for space exploration. Which of these does NOT have a direct connection to space exploration? A. X-ray machine B. freeze-dried food C. infrared ear thermometer D. portable cordless vacuum

The x-ray machine

Explanation:

Freeze dried food was developed with NASA. Food in space for the astronauts needed to have long shelf lives, be light, easy to pack, and easy to prepare.

The infrared ear thermometer was developed by Diatek and NASA using infrared astronomy technology to measure the infrared energy given off by the ear drum.

The portable cordless vacuum was developed by Black and Decker and NASA as a specialized drill to collect samples below the surface of  the moon.

The X-ray machine was invented in the 19th century, way before the space program and NASA.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.