Mrna : ribosome : : select one: a. endoplasmic reticulum : golgi aparatus b. nucelus : cytoplasm c. signal protien : cell membrane d. microtubule : microfiliment

B

Explanation:

mRNA is also called messenger RNA. It is produced in the nucleus during transcription by using DNA template. The nucleus houses the genetic material (DNA) of an eukaryotic cell, hence, it's just natural that the DNA be transcribed there. The mRNA, also called RNA transcript acts as a carrier, that carries the encoded information in it out of the nucleus into the cytoplasm, where protein synthesis takes place.

Ribosome is a complex containing ribosomal RNA and other enzymes found in the cytoplasm of living cells, which organises the process of translation and catalyze the reaction that joins amino acids to make a protein chain. They are either found floating freely in the cytoplasm or attached to the endoplasmic reticulum to form the Rough Endoplasmic reticulum.

Hence the reason for the answer, mRNA is produced in the nucleus, while ribosomes are found in the cytoplasm

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

i believe the answer is a or 1