Question

task 1: introduction to biomagnification and ddt
watch the biomagnification and the trouble with toxins video by the amoeba sisters on youtube. as you watch, answer the following questions.

1. how did ddt affect the bald eagles?
2. what does biomagnification describe?
3. what percent of energy do consumers receive from the trophic level below them?
4. describe the process of biomagnification in complete sentences.
5. describe how ddt moves through the food chain, eventually harming bald eagles in complete sentences.

Explanation:

These questions are about biomagnification and DDT's impact, which falls under Biology (a subfield of Natural Science). To answer them, one would watch the specified video to gather information:

1. DDT caused bald eagles' eggshells to thin, leading to broken eggs and reduced reproduction.
2. Biomagnification describes the increase in concentration of a toxic substance (like DDT) in organisms as it moves up the food chain.
3. Consumers receive about 10% of the energy from the trophic level below them.
4. Biomagnification is the process where a pollutant (e.g., DDT) enters the ecosystem, is absorbed by primary producers (like plants/algae), then accumulates and becomes more concentrated in organisms at each successive trophic level (as predators eat prey with the pollutant, and the pollutant isn't easily broken down or excreted).
5. DDT is sprayed on crops or enters water bodies. It's absorbed by primary producers (e.g., plankton in water or plants on land). Herbivores eat these producers, taking in DDT. Then, carnivores (like fish - eating birds, eventually bald eagles) eat the herbivores. Since DDT is fat - soluble and not easily eliminated, its concentration increases at each trophic level. By the time it reaches bald eagles (top predators), the DDT concentration is high enough to thin their eggshells, reducing their reproductive success.

Answer:

1. DDT thinned bald eagles' eggshells, causing egg breakage and reduced reproduction.
2. Biomagnification describes the increasing concentration of a toxic substance (e.g., DDT) in organisms as it moves up the food chain.
3. 10%
4. Biomagnification is the process where a pollutant (e.g., DDT) is taken up by primary producers, then becomes more concentrated in organisms at each higher trophic level as predators consume prey with the pollutant (since the pollutant is not easily broken down or excreted).
5. DDT enters ecosystems (e.g., via spraying or runoff), is absorbed by primary producers. Herbivores eat these producers, ingesting DDT. Carnivores (including bald eagles' prey) eat herbivores, and DDT accumulates and concentrates at each trophic level. By the time it reaches bald eagles (top predators), high DDT levels thin eggshells, harming reproduction.