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.
Products that produce deadly vapors are called corrosives
Answer:
In law and government, de facto describes practices that exist in reality, even though they are not officially recognized by laws.
In law and government, de jure describes practices that are legally recognised, regardless of whether the practice exists in reality.
Please mark as brainliest:')
<span>-Be alert to unsafe situations and report them immediately.
-Identify the types and locations of all chemicals or hazards.
-Reading and interpreting chemical labels and hazard signs.
-Use personal protective equipment (P.P.E)
-Locating and and using the M.S.D.S. manual containing all the safety data sheets.</span>
Chancre
The first sign of syphilis is a small sore, called a chancre (SHANG-kur). The sore appears at the spot where the bacteria entered your body. While most people infected with syphilis develop only one chancre, some people develop several of them. The chancre usually develops about three weeks after exposure.
