When two monosaccharides link to form a disaccharide, the by-product is when two monosaccharides link to form a disaccharide, the by-product is glucose fructose oxygen gas water?

The answer is water.

That is when two monosaccharides link to form a disaccharide, the by-product is water.

Here glucose and fructose are monosaccharide that combines to form a disaccharide that is sucrose and water formed as a byproduct that can be seen in the image attached.

So Water is the byproduct that is formed, when two monosaccharides link to form a disaccharide.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

a is the answer to this question

explanation: