Answer:
See explanation
Explanation:
Molar mass of N2H4CO = 60 g/mol
Given that the relative atomic mass mass of each element is known, We discover that;
Percentage by mass of nitrogen = 28/60 * 100 = 46 .7%
percentage by mass of hydrogen = 4/60 * 100 = 6 67%
Percentage by mass of carbon = 12/60 * 100 = 20%
Percentage by mass of oxygen = 16/60 * 26.67%
The threat to validity that is likely to occur in the scenario above is Selection Bias.
<h3>What is Selection Bias?</h3>
This occurs when a researcher has control and intentionally chooses those who are going to be researched, observed, or studied. To eliminate this bias, the scientist must ensure that the sample population is selected very randomly.
Other threats to validity are:
- History
- Maturation
- Attrition
- Social Interaction
- Instrumentation
- Testing
- Regression to the mean, etc.
Please see the link below for more about Threat to Validity:
brainly.com/question/4168290
Answer:
The high growth of population in Terai region is because of migration from mountain and hill , growth of the population in the Terai region itself and immigration from outside i.e. from other neighbouring countries
