Low dissolved oxygen concentrations that occur in many bodies of water when nutrients stimulate the growth of algae that subsequently die and are decomposed by oxygen-using bacteria.
Answer:
If a spacecraft is in space for a long time, radiation is a problem. Designers must figure out a way to protect astronauts from the radiation.
Answer:
Which of the following countries has the lowest arithmetic density?
Canada.
<em>Arithmetic density means the number of inhabitants per unit of measurement. </em>
The lowest arithmetic density is in Canada because:
- <em>it has large areas of boreal forest (conifers).
</em>
- <em>there are very low temperatures and an unfavorable climate is present (especially in the northern part of Canada).</em>
Look at the world clock on your phone
