Why are some shellfish (ocean animals, like oysters, that have shells) in danger of going extinct? None of the above. Fewer sharks is disrupting the ecosystem for these organisms. C The ocean is getting too salty Carbon in the atmosphere is making the ocean more acidic and they can't build their shells. E Warm water is making less algae (food for shellfish)

It's option C

Explanation:

Ocean is getting acidic

The question is formatted a bit weird. Shellfish are in danger of being extinct because carbon makes the ocean more corrosive and acidic, making it harder for them to build shells.

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.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.