Answer:
Milankovitch cycle
Explanation:
Milankovitch cycle was discovered by Mr. Milutin Milankovitch, who described that there occur changes in the earth's orbit in 3 cycles which are distinctly of different lengths.
There occurs changes in the shape of the earth's elliptical orbit from minimum to maximum and comes back to the minimum, which takes near about 100,000 years.
The tilt of the earth is about 23.5°, which changes from about 21.5° to 24.5° and gain goes back about 41,000 years approximately.
The imaginary internal axis of the earth rotates unsteadily with a period of nearly 23,000 years.
Thus, these changes occurring in the earth's elliptical shaped orbit takes place every 100,000 years and is a cycle of the Milankovitch cycle.
The answer to the question above is the fourth option which is <span>RNA.
RNA </span>stands for Ribonucleic acid. It is a nucleic acid. RNA is a polymeric molecule which has several biological roles including <span> coding, decoding, regulation, and expression of genes.</span><span>
</span>
Darwin's theory of the origin of species is a work of scientific literature by Charles Darwin which is considered to be the foundation of evolutionary biology.
Hi
Before answering the question, we need to understand what homologous organs are?
These are basically different organs that are found in different animals which apparently look different however they have similar anatomical structure. These are called homologous organs and they are an excellent source that shed the light on evolution of different organisms.
Homologous organs of three animals:
1: Dolphin's flipper
2: A bird's wing
3: Human arm
Although these are three different organs of three different organisms but still they are homologous organs, this is because the anatomical features of these structures suggest that these have similar sort of arrangement of bones, and wing sub parts. This suggests that in past, all these three organisms have a common ancestor and later due to evolution, they evolved into new creatures.
Hope it helps!