Answer:
Shape, Size, Height, Type of Food
Explanation:
The color is the variable and the type of hummingbird can't be controlled.
The correct answer for fill in the blanks is enhances the rate of natural cleanup process by introducing the pollutant consuming microorganisms or specific nutrients that helps the organisms to degrade pollutants.
It is the process by which the microorganism are introduced into the dirty environment to clean up the area. The microorganisms that feed on a particular nutrient is introduced into the space and it is cleaned up using these microorganisms.
Problems with stomach emptying (gastroparesis) occur when stomach muscles don't work correctly. Although the underlying cause can't always be found, damage to pacemaker cells and nerves in the stomach due to diabetes or surgery can lead to stomach muscle dysfunction.
Electromagnets can be switched on and off. This is good in a scrap yard because they need to pick heavy pieces of metal and then drop it.
