Horses are able to mate with donkeys. their offspring are animals known as mules. mules are sterile, which means they cannot reproduce. using this information, what can you conclude about horses and donkeys?
a. horses and donkeys are the same species.
b. horses and donkeys belong in different phyla.
c. horses and donkeys are different subspecies of the same species.
d. horses and donkeys are different species.

D. Horses and donkeys are different species.

Explanation:

Horses and donkey can breed to produce a "Mule" however they are not fertile so horses and donkeys are considered different species.

rtgh gf tfg sxzt hgstr hsd gh trh fhrd rd

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.