Eliminate
B) cause algae and plants to overgrow and pollute the water when they die.
C) accumulate in animals and build up in toxic concentrations as they pass through the food chain.
D) eliminate most of the algae and plants in the food chain, causing animals to starve, at higher levels of the food chain.
C
Pesticides, such as DDT, often have harmful effects on aquatic ecosystems because they accumulate in animals and build up in toxic concentrations as they pass through the food chain. This is referred to as bioaccumulation.
Explanation:
As the DDT is ingested it accumulates in the body tissues because the body of the organisms is unable to break down and excrete the chemicals fast enough or at all. This bioaccumulation also goes up the food chain/web as higher organisms prey on the lower organism on the web. For example, the aphids feed on the leaves sprayed with DDT. They are then preyed on by beetles and flies and bugs. These bugs are then eaten by birds. Eventually, the DDT will be found in the tissues of the birds, even in higher concentrations (due to biomagnification).
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Answer:C
Explanation:USATESTPREP
Amoebas are eukaryotic microorganisms that have a similar mode of nutrition to the process described for white blood cells. They capture and engulf food particles, such as bacteria or small organic particles, through a process called phagocytosis.
After engulfing the food particle, amoebas form a food vacuole around it. Within the food vacuole, enzymes are secreted to digest the captured material, allowing the amoeba to obtain nutrients and energy from the ingested material.
This process of engulfing and digesting food is known as phagocytic nutrition and is a characteristic feature of certain eukaryotic organisms like amoebas.
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Answer:
The Answer Is C): Amoeba
Explanation:
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Answer:
Human actions affect ecosystems through exotic species introduction, disease transfer, land conversion, habitat loss, modification and fragmentation, resource exploitation etc. All of these actions reflect negatively on any given ecosystem.
Explanation:
Abiotic factors are water, air, soil, sunlight, and minerals. Biotic factors are living or once-living organisms in the ecosystem. All of which human actions affect.
Answer:
nothing
Explanation:
25% chance
50% chance
75% chance
100% chance
Lactase refers to an enzyme that can dissociate lactose sugar into glucose and galactose. This enzyme plays an important role in the digestion of milk that comprises high lactose sugar. In case, if a mutation occurs in the gene codon of lactase, then two possibilities can take place. These are as follows:
1. Loss of mutation: In this case, the person becomes lactose intolerant because of mutation in lactase gene codon. Due to this, there is low mRNA expression and thus low production of the enzyme lactase. This is also known as lactase non-persistent phenotype.
2. Gain in mutation: In this case, the person gain an increase in mRNA expression of the lactase gene, thus more production of lactase takes place than usual. This kind of individual exhibits lactase persistent phenotype.
A mutation in the lactase gene could lead to changes in the structure and function of the lactase enzyme, affecting the organism's ability to process lactose. Depending on the type and location of the mutation, the effects can range from mild to severe, possibly causing diseases related to lactase deficiency.
A mutation in the coding region of the lactase gene could have several potential effects, depending on the nature of the mutation. Mutations could include insertions, deletions or other changes in the DNA sequence that could alter the structure and function of the resulting protein. Such changes could increase the possibility of the protein having extra bends and loops, potentially altering its effectiveness in metabolizing lactose.
For example, in the case of E. coli, mutations in the lactase gene could disrupt the operon's regulation of lactose metabolism.
With a functioning lactase gene, when lactose is present, it triggers the transcription of genes that allow the bacterium to metabolize lactose. However, if the lactase gene were mutated, it could prevent this from happening, leaving the cell unable to process lactose as a food source.
Therefore, considering the potential range of effects, a mutation in the lactase gene could cause significant changes in an organism's ability to process lactose, and it could also cause diseases linked to either the lack of lactase or to structurally abnormal lactase proteins.
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The tundra biome does not support animal life. D just took the test