AQUATIC SCIENCE 2) What happens between 4 and 0 °C? Why is this important?
At this temperatures is when water increases in salinity and the high altitudes cause the
oxygen-nitrogen bonding to break.
The hydrogen bonds expand so that they achieve the greatest distance from each other,
and this results in hexagonal ice crystals. It also results in spaces in between the ice
molecules, which is what makes the solid phase of water less dense than the liquid phase.
The oxygens separate from the hydrogens creating a point where the water will boil and
break its molecule.
The hydrogen bonds contract so that they achieve the smallest distance from each other,
and this results in tetrahedral liquid water.
The hydrogen bonds are stronger than ever creating the least amount of surface tension
and allowing for molecules to evaporate.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.