Because plate movements have raised ancient sea floors above sea level, a. there is less coral than there used to be. b. coral reefs are only found in the deep ocean. c. limestone that began as coral reefs can be found on the continents. d. all remains of ancient coral reefs have been lost

c. limestone that began as coral reefs can be found on the continents.

Explanation:

Limestone formation dates back to the time when oceans covered the earth surface. The shells and skeleton of dead organisms of ocean were the sources of limestone at the bottom of oceans. However, the event of uplift of sea floors above the sea level led to availability of limestone on present day land.

d.

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.