The maximum time a person could listen to a sound of 87 decibels is: 8 hours
<h3>Meaning of Decibels</h3>
Decibels can be defined as the unit used by scientists to measure sound level.The values of Decibel ranges from a very low value to a very high value and the higher we get the more dangerous it is to our human ear.
In conclusion, The maximum time a person could listen to a sound of 87 decibels is 8 hours
Learn more about Decibels and human hearing : brainly.com/question/1291668
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The two European countries that were the biggest winner in the race to seize African colonies were BRITAIN AND FRANCE.
In the early 18th century, seven different European countries held African colonies, of these seven, Britain and France were the biggest holders. The major reason reason behind the colonization is the empowerment and the advancement of the colonizing countries. It was only two African countries, Ethiopia and Liberia that remain uncolonized during this period.
Answer:
peptide antigens by MHC class II molecules
Explanation:
Helper T cells are activated by peptide antigens by MHC class II molecules. These antigens express on the surface of antigen-presenting cells (APCs). After activation, the T helper cells divide and secrete cytokines to assist the immune response.
B) They should test their hypothesis before coming to that conclusion.
