Answer:
The USA became involved in Vietnam because it feared the spread of communism. The USA were unable to defeat the Vietcong and were met with growing opposition to the war back home.
this is the only one I can answer, I'm sorry. I hope this helps though
B) European countries and the United states
Answer:
Secondary Industries produce finished products after being supplied with unrefined resources
Explanation: Big brain
The ancient Egyptian noblemen usually would be very busy with their daily appointments with overseers of their much treasured land. However, music played a vital role in their lives. To pass time, they threw lavish parties. Consumption of beer, wine, and narcotics was common.
They also spent their leisure time in their own gardens next to their houses like people do today. They could go outside and relax. They also loved to over-stuff themselves and enjoy a good laugh. Fishing was also done at their free time and would go severally to river Nile. Most of the fishing was enjoyed as a timeout from hard work. They also hunted for sport. Noblemen caught wild animals.
Answer:
a) calculating the concentration at which 50% of the test organisms of a particular species die
Explanation:
Bioassays -
<u>Bioassays is an analytical method to assess the effect of marine pollutant on the organism by estimating the concentration at which 50% of the test organisms die after exposing the test organisms for a specified time.</u>
It can be done by quantitative or by qualitative experiment , or direct or indirect .
It is used to detect the biological hazards or give the quality assessment of the mixture .
It is also used for the monitoring the quality of water .
