There are three major, distinct groups of organisms: bacteria, archaea, and eukaryotes. However, until recently bacteria and arc
haea were considered much more closely related than we know they are today. What is one of the most important ways scientists determined the evolutionary distinctiveness of these three groups? Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices A) They compared cell structure in all three groups.
B) They compared equivalent DNA sequences in all three groups.
C) They compared the size of organisms in all three groups.
D) They compared the structure of DNA molecules in all three groups.
E) They compared the organelle function in all three groups.
The Eukaryotes, Bacteria and Archaea were firstly thought to be belonging to same kingdom as their characters were very much similar.
Until their DNA sequence were used as a basis of their distinction they were put into similar criteria. Due to advanced research their DNA sequence were analyzed and then it was found that the three organism are different.
The first stage in Meiosis I is prophase I. During this stage the DNA condenses into chromosomes. During prophase I, homologous chromosomes pair up and exchange sections of DNA. This is called recombination or crossing over
They are the species which are found only in a particular area. They can be a plant, animal or microorganism. They are at great danger of becoming extinct due to the following reasons: - As they are restricted to a particular area so loss of their habitat is the major reason which could lead to extinction.
