Answer:
To study the evolutionary relationships of the earliest forms of life on Earth we need to examine a structure that is present in all cells and changes very slowly over time.
All life on Earth was initially divided into three main Domains: the Bacteria, the Archaea, and the Eukarya, based on the similarities of their:
Ribosomal RNA
Explanation:
Ribosomal ribonucleic acid: RNA (rRNA, mRNA, and transfer RNA (tRNA), is a noncoding molecule of RNA in cells, which is the main building block for ribosomes protein-synthesizing organelle, exported to the cytoplasm to help translate the information in messenger RNA (mRNA) into protein. They are essential to all living organisms.
Because all these cells are similar in nature within the bacteria, the archaea and the eukaryait, there is a thought that all cells came from a common universal ancestor cell that eventually evolved into three different kind of cells, representing each of these domains.
Governor Orval Faubus.
EXPLANATION
On September 2, 1957, Governor Orval Faubus announced that he would call in the Arkansas National Guard to prevent the African-American students' entry to Central High, claiming this action was for the students' own protection.
The fastest way to communicate across continents in the 1500s was by ship. If you wanted to bring a certain message across a continent than there was no faster way than actually sending it on a ship and waiting for the ship to arrive safely to the other continent.
Quetstion 4 is A The other question is B
Answer:
Explanation:
The Columbian Exchange: from the Old World to the New World
On his second voyage, Christopher Columbus brought pigs, cows, chickens, and horses to the islands of the Caribbean. Many Native Americans used horses to transform their hunting and gathering into a highly mobile practice.
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