The first genetic material on earth was probably ________.
A) DNA produced by reverse transcriptase from abiotically produced RNA
B) DNA molecules whose information was transcribed to RNA and later translated in polypeptides
C) self-replicating RNA molecules
D) oligopeptides located within protobionts
Answer:
C) self-replicating RNA molecules
Explanation:
RNA molecules are considered to be the first genetic material that evolved on the earth. Assembly of nucleotides gave rise to single stranded RNA molecules that could catalyze various processes. These RNA molecules were able to replicate themselves. In this way, the self-replicating RNA molecules served as the first genetic material. Later, the accumulation of several mutations such as the evolution of thymine base from uracil and deoxyribose sugar from the ribose sugar gave rise to DNA.
Inner core
The inner core is the most dense layer of earth. The second next dense layer would be the outer core.
I may be wrong but-
6 carbons
12 hydrogens
6 oxygens
Explanation:
- Catastrophism is a theory developed by Georges Cuvier that states that natural history has been punctuated by catastrophic events that altered the way live developed. Gradualism is a theory that stipulates that changes of organic life and earth itself occur through gradual increments with transitions that are slow rather than periodic and rapid. Uniformitarianism suggests that the Earth's geological processes acted in the same manner in the same intensity in the past as they do in the present and that such uniformity is accountable for all the geologic change.
- Jean-Baptiste de Lamarck's theory proposes a change through use and disuse when environments changed, organisms had to change their behavior to survive, if they began to use an organ more often it would increase their lifetime and their offspring will inherit this modified organ. As these organisms adapted, nature also drove them from simple forms to increasingly complex ones.
I hope you find this information useful and interesting! Good luck!
The correct answer is option B, that is, Ciliophora.
Ciliophora is the term used for the phylum usually known as the ciliates. Ciliates are the most complex of cells, exhibiting an elaborate cytoskeleton, cilia, two distinct types of nuclei. Ciliates are single-celled species, which at a certain phase of their life cycle, possesses cilia, that is, short hair-like projections used for food gathering and locomotion.
