Answer:
Conservation helped to reduce air pollution by using fewer fossil fuels, such as gasoline for a car, reduces the emission of harmful pollutants into the air
Explanation:
Answer: d. double-blind
Explanation:
A double blind study can be define as the study in which both the researcher and participant do not know which participant is receiving a particular treatment. This method is useful as it prevents the bias in the results of the experiment.
The given situation is the example of double-blind study. Here, the participants as well as the researcher do not know which group of subject are receiving bacteria in the yogurt and which group is not receiving.
Answer:
The correct answer will be option-B
Explanation:
The potentially hazardous foods are the food and food products which contain all the intrinsic factors to support the growth of pathogens.
In the given question, the packaged foods are not considered potentially hazardous foods as they are packaged so are protected from the microbes.
The other foodstuff, even the boiled food products are hazardous as they provide the necessary conditions required by the microbes to grow like moisture and are in direct contact with the environment.
Thus, Option-B is the correct answer.
By countless hours of research and tests
