Im assuming this is the question:
You have been studying a large lake ecosystem. You learn that toxins have been dumped into the water. You predict that the population with the highest concentration of the toxin would be the
ducks
zooplankton
algae
predatory birds
small fish
The answer to that question is predatory fish. In contaminated areas, bottom-dwelling fish are especially likely to have high levels of these chemicals because these substances settle to the bottom where the fish feed.
Here's an article to help in case:
https://www.doh.wa.gov/CommunityandEnvironment/Food/Fish/ContaminantsinFish
Answer:Viroids are short pieces of naked RNA or DNA molecules without a protective coat of protein or lipoprotein.
Explanation:
The purpose of the renal system is to eliminate wastes from the body, regulate blood volume and pressure, control levels of electrolytes and metabolites, and regulate blood pH. The renal system organs include the kidneys, ureters, bladder, and urethra.
Answer:
B. a light bulb burned out and "closed" the circuit.
Explanation:
Unscrew one bulb. If the other bulbs turn off, it is a series circuit. A light bulb glows when electrons flow through it. As the electron flow increases, the brightness increases.
When lights are attached in parallel, each light is on its own circuit to the power source. If one filament burns out, it has no effect on the remaining lights, as they each continue to be in a closed circuit with the power source.