we know that
the surface area of the top of the water
is calculated with the formula of the area of a circle
Step 1
Find the radius of the water tank in the middle of the tank
by proportion
so
For h=5 m
the radius is equal to r=1.5 m
Step 2
Find the surface area
therefore
the answer is
the surface area of the top of the water is 
True because someone might make the wrong choice and not be under any drugs or influence
There are numerous circumstances that give pathogens the chance to harm people.
The first occurs when an infection has already weakened the immune system. In situations like this, other pathogens may infect the host opportunistically and cause an infection. If the human host does not maintain proper personal and environmental hygiene, that is another condition. Many pathogens thrive in unclean environments, so by failing to maintain proper environmental hygiene, a person increases his risk of contracting a pathogen.
Finally, since so many pathogens are transferred by vectors, humans are more likely to contract the diseases that these vectors aid in spreading if they do not take the necessary precautions to stop their activity.
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Lungs- heart- arteries. Capillaries- veins
