Evidence for evolution comes from many areas of Biology. Choose each of the examples that represent categories or specific examples of biological examples of evolution.
A Bones found in a dolphin fin follow the same pattern as bones found in a human arm.
B Lions and elephants live in the grasslands of Africa
c Dolphins have hind limbs as an embryo but are not visible as an adult
D Hawks and snakes both compete for mice as prey
E Birds have wings and humans have arms
F Ferns and flowering plants have similar DNA

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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.