During gold mining activities along the Amazon River, mercury (which is used to separate gold from other minerals) is released and dissolves in the water. Which organism would have the highest concentration of mercury in its tissues? A.A bird that feeds on large fish that swim in the riverB.A large fish that feeds on smaller fish in the riverC.A small fish that feeds mostly on algae growing in the riverD.Soybeans watered with water from the river

Where would you expect to find the largest concentration of mercury within marine life?Question 9Answersea birdsbenthic organismssharksshrimp

Toxic substances such as cyanide and mercury used in the collection process of gold from rivers and streams have entered the waters and tributaries of the Amazon River and from there enter the _____.Group of answer choiceswater tablefood chainsediment layerswater cycleatmosphere through evaporation

As a result of biomagnification, mercury levels would be highest in a(n)Multiple choice question.herbivore.tertiary consumer.primary consumer.producers.

Pond water can contain many types of organisms. Which of the following are you most likely to find in a pond water sample?

Since the Industrial Revolution, people have been pouring toxic waste into the land, ranging from petroleum products to heavy metals, and it is starting to have adverse effects on planet Earth itself as well as human and animal life. There is some level of mercury in all fish tested in the United States, and heavy metals in soil are now affecting the food supply. In Brazil, abandoned gold mines have leaked mercury into the soil. This very toxic heavy metal is absorbed by the grass and then eaten by cows, which are then processed for human consumption.     Nature, however, has an amazing way of dealing with such toxins. There are certain plants that can be grown which will remove toxins from the ground in a process called "phytoremediation" that is very promising for making contaminated soil safe for humans. Scientists are working with farmers in Brazil to grow maize and canola plants around farms, which assimilate the mercury and gold that are in the soil. The plants are then burned to ash, and the heavy metals can then be extracted from the ash to pay for the phytoremediation process. Mustard greens and pumpkin vines have been used to clean up yards and factory sites. Sunflowers have been used to rid the soil of radioactive metals near nuclear plants.     There are a few drawbacks, or precautions, when contemplating phytoremediation for soil treatment. The plants need to thrive in the climate of the soil, and they can only remove toxins as deep as their roots grow. So, phytoremediation will not clean up contaminated groundwater. When considering using plants to clean up soil, be mindful not to introduce an invasive species that will take over and be hard to control. Cleaning soil with plants takes time and does not happen overnight, but it is a natural, cheap, and environmentally friendly solution.4Which statement best expresses a central idea in the passage? A. Farmers in Brazil are having a hard time because of soil contamination. B. Phytoremediation is an easy way to naturally extract gold from soil. C. Petroleum products have contaminated our soil and the beef industry. D. Using plants to clean soil is a natural, sound, and inexpensive process.