1. ddt is also toxic to fish and aquatic invertebrates. based on what you know about ecosystems and food chain dynamics, what are some potential impacts to an aquatic ecosystem that receives a particularly high dose of ddt (i. e., a much higher original concentration of ddt in the water)?

DDT can sustain in environment there by leading to bio magnification

Explanation:

Bio magnification is a process in which the concentration of toxic element or chemical increases in the higher order of food chain. DDT being a persistent compound in nature risk the occurrence of bio magnification in an ecosystem at higher levels.

DDT is insoluble in water and hence it is stored in fatty tissue of animals. This comes from the agricultural waste, industrial waste poured into any water body without treatment.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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d. the weight of the book