I think it's oxygen and water because they are the substance for cellular respiration.
<span>A. The nebula contracts and shrinks instead of expanding
</span><span>Nebula is the cloud of interstellar dust and gas that forms a star. It is collborately shaped during colliding and collapsing of the interstellar mediums this is influenced by the gravitational attraction of the atoms and particles in the entites. Hence, there are three types of nebular namely, are classical nebula, diffuse nebula, planetary nebular and supernova remnants.</span>
<span>The name Mesopotamia comes from the Greek for 'middle' and 'river,' and meant'' between the two rivers ''</span>
Hemophilia is a recessive trait because the abnormal gene is responsible for the hemophilia carried on the X chromosome
Behavior of an individual that may result in negative consequences
