General Science Questions

Secretion of hormones for calcium regulation in blood and bones is not a function of a bone.

The highway transportation system has helped to reduce traffic deaths with its easy flow of traffic under rash driving rules and also it helped to country economically.

In the given options, all are the benfits of ozone. But, the main benefit of ozone is absorbing ultraviolet radiation from the Sun.

Animals active at night are known as Nocturnal.

1) If they use the same cutting board/counter to cut raw chicken, and other foods with out sanitizing in between. 

2) If they have a cold, flu, or pink eye and are handling food, coughing without covering their mouth, then washing their hands.

3) If they don't properly wash their vegetables.

4) Not storing foods at proper temperatures.

And so many other reasons for Food handlers can contaminate food.

Inhaling of oxygen and releasing of carbon dioxide to make our living is the process called as respiration. We know that, air is a mixture several gases like 78% of nitrogen, 21% of oxygen and several other gases with watervapour.

Hence, Oxygen is essential for respiration process.