What might cause scientists to change a scientific theory?
a. some people disagree with it
b. it covers too broad a topic
c. new evidence contradicts it
d. it is too old

The correct answer will be option-C.

Explanation:

A scientific theory is a well-substantiated prediction or an idea which explains the natural process or phenomenon in depth. A scientific theory is made on the basis of facts and evidence of the previous research and theories.

The scientific theory is the elaborate explanation of any hypothesis which could be changed and modified with development in science. The most possible reason for a theory to be changed is that new evidence of new research can contradict the previous facts.

Thus, Option-C is the correct answer.

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.