Why did the united states ban the use of ddt?
it began mutating.
it became too costly to continue its use.
its risks outweighed the benefits.
it was no longer effective.

The correct answer is : C.) Its risks outweighed the benefits.

The DDT is an colorless, tasteless chemical compound which was originally developed as an insecticide. DDT was used during second world war to control malaria among the troops and the civilians.

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.