Contaminated fish are unhealthy to eat because they contain large amounts of toxic chemicals, such as
a.
calcium
b.
mercury
c.
potassium
d.
smog

B.mercury

Explanation:

Fish and bivalves concentrate mercury in their organisms, often as methylmercury, an organic compound of mercury that is highly toxic. The investigations carried out have made it possible to determine that marine products can contain diverse concentrations of heavy metals, particularly mercury and contaminants soluble in fats coming from water contamination. Fish species that are long-lived and occupy a high position in the food chain contain higher concentrations of mercury than other species. The presence of mercury in fish can have repercussions on the health of human beings since when consumed fish can produce mercury poisoning, especially of those women who are pregnant or who can get pregnant, mothers who are breastfeeding, and babies.

native americans

american indians have appeared on many u.s. coins including the buffalo nickel

benjamin franklin learned a lot about democracy by observing the iroquois indian

the term "indian" originated with christopher columbus. he thought that he had reached the east indies when he landed in america and therefore named the inhabitants indians.

camping

camping can relieve stress and depression

your campfire may be a hazard

long-term campsites include permanent and semi-permanent setups and can lead to closer relationships with neighboring campers

buffalo

buffalo are herbivores and feed on about 60 pounds of plant material and grasses a day.

buffalo are considered to be an adult when they reach 3 years old.

buffalo’s tail can be almost three feet long, and they use it to swap at pesky bugs.

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.