1. before the introduction of the yellow crazy ant to christmas island, land crabs ate many plant seedlings in the forest, maintaining a relatively clear forest floor. as the crab population has declined, plant seedlings have flourished. the forest floor is now covered with plants. choose the statement that best describes what is occurring on the forest floor.
a. primary succession is occurring because the ant is a new species changing the ecosystem.
b. secondary succession is occurring because the organisms on the forest floor are changing.
c. climax vegetation is occurring because the seedlings finally have the chance to grow.
d. primary succession is occurring because more plant life is healthier for the ecosystem.

B. Secondary succession is occurring because the organisms on the forest floor are changing.

Psss i just took the quiz

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explanation:

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.