Answer: C. a substance changes state from solid to liquid
Explanation:
A physical change is one that occurs when the substance of subject changes its form as a result of a reaction. The most noticeable indicator of this is a change in the state of matter such as a change from liquid to solid like the above.
The other options show a chemical change as the form was not changed but its chemical properties such as color was changed or it lost some atoms which became air.
Answer:Selection bias
Explanation:Selection bias refers to selecting individuals in a way that a proper randomisation is not achieved which makes the result not representative of the whole population. This is also called selection effect.This usually occurs when a researcher chooses only participants that will support the idea he has in mind about the variable of interest that they are researching. For example if someone is researching the effect of healthy food on particular population but instead of selecting participants randomly, a researcher goes to a health food market ,vegetable places and gyms. Then a researcher ends up concluding that healthy eating is crucial within this population.
This is wrong because a researcher only chose places that were convenient to this research.
Answer:
The correct answer is Compulsory Voting
Explanation:
Countries that are governed by democracy and respect the choice of citizens, use suffrage as the electoral method, where people vote for the candidate of their choice.
There are two types of votes: compulsory and voluntary. Some countries such as Australia, Brazil, Belgium, among others, exercise compulsory voting. Consider that people have the right but also the obligation to vote, establishing as a citizen's duty to go to the voting centers to exercise their right to choose.
The objective of the countries that exercise compulsory votes is to avoid electoral fraud and the deprivation of the right to vote, and they usually fine people who do not appear at the voting centers.
<em>I hope this information can help you.</em>
<span>Mike would mention physical attractiveness.</span>
Physical attractiveness is the key factor in an adolescent
age around which a romantic relationship is built. Studies demonstrate that relationships
turn out to be more restrictive, dyadic, of longer term, and all the more
sincerely and sexually intimate through the span of youthfulness. In addition,
relationship involvement in young age is related with an improved probability
of dwelling together and marriage in youthful adulthood.
