Questions

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.

Sun - The Solar Energy is the ultimate source of energy in an ecosystem.

Here, the error is in part 4. As 'messages' is plural “speaks” will be replaced by “speak”. The rule applied is of subject verb agreement

Enzymes in the body are those which play an important role of breaking down the larger molecules to small and speeds up the chemical reactions.

Mutual exclusion

Hold and wait

No preemption

Circular wait

The most number of countries are in the continent Africa. Eventhough, Asia is the biggest continent in its size, Africa is the continent with 54 countries whereas Asia have 48 countries.

Presently, there are 226 flood forecasting stations consisting of 166 level forecasting stations for villages and towns and 60 inflow forecasting stations for reservoirs/dams/barrages in the country. Existing flood forecasting network covers 22 States / Union Territories and 19 major river basins / sub-basins in the country.