Answer:
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.
Answer:
<u>1</u><u>)</u><u>Amplitude</u>
<u>2</u><u>)</u><u>Modulation</u>
<u>3</u><u>)</u><u>Frequency</u><u> </u>
<u>4</u><u>)</u><u>Modulation</u>
The best title to the excerpt above that also summarizes the points provided is:
<span>the importance of getting adequate sleep at night
</span>
The situations presented are related to the importance of getting enough sleep for adults and adolescents. The advantages and disadvantages of having ample hours of sleep at night are also highlighted.