Archaea<span> have more complex RNA polymerases than </span>Bacteria<span>, similar to Eucarya. Unlike </span>bacteria<span>, </span>archaea<span> cell walls do not contain peptidoglycan. </span>Archaea<span> have </span>different<span> membrane lipid bonding from </span>bacteria<span> and eukarya. There are genetic </span>differences<span>.</span>
The DNA controls the cell's activities. It is usually found in the nucleus.
In order to understand the totality of the interactions among the organisms in the biosphere, we need to at least understand <span>how the all genes function within organisms and </span>interact<span> with others organism and environment around it.
If we try to make this effort in a world where organisms will keep evolving and environment will keep changing like us, that tasks is impossible to finish.</span>
The phrase to fit into the blank is "sexual reproduction"!
In sexual reproduction each of the parents produces a gamete and contributes to half of the offspring's genes. This means that the offspring is a unique composition of the two parents.
In contrast, in a asexual reproduction, the offspring would likely have the same genetic code as the parent.
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