Q5: why is it necessary to rinse the inside of erlenmeyer flask with di water periodically?

The Erlenmeyer flask, which is also known as the conical flask, should be rinsed periodically using the deionized water because the Erlenmeyer flask is used for titrations and most of the titrations involve ions. Cleaning the Erlenmeyer flask with normal water will lead to the addition of the extra ions and this will disrupt the titration readings. Hence, the conical flask should be cleaned with deionized water to obtain correct results.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.