There are nearly 500 variants of Hemoglobin that occur naturally. Most of them exhibit some sort of cooperative binding. In the Cowtown variation, there is a single amino acid mutation that destabilizes the T-state conformation of Hb. What affect would this have on Cowtown's affinity for oxygen? Compare and contrast how the interaction between WT Hb and Mb would differ from the interaction of Hb-Cowtown and Mb. Would this affect the overall amount of oxygen delivered to tissues? In what way?

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

answer; 4 electrons;