Evolution Test - 4

Jurassic period of Mesozoic era characterized presence of Gymnosperms as dominant plant and first birds evolved from reptiles. Dianasours are also a kind of reptiles.

The organic compounds first evolved in earth required for origin of life were proteins and nucleic acids. Proteins are made of amino acids arranged in different order and DNA and RNA are nucleic acids.

The first experiments to prove the spontaneous generation theory were done in the XVII century and a doctor called Jean Baptiste Van Helmont declared he had performed a unique experiment: he placed a dirty shirt together with some wheat and according to him, mice were born 21 days later.

According to the Doctor the sweat in the shirt was the active element which gave life to the inert matter.

An organism that lays 5 eggs, hatch the 5 eggs to reproduce 5 offspring can be considered as most evolved out of the other given condition. Least evolved organism lays more egg but produce only a few offspring.

According to early Greek thinker units of life called spores. These spores were transferred to different planets including earth.

Analogous structure is that structure which performs similar function in spite of different origin. Wings of bat and forelimb of cattle do not perform same function and have common origin.

In evolutionary biology, the term analogous structures pertain to the various structures in different species having the same function but have evolved separately, thus do not share common ancestor.

Examples of analogous structures are as follows: wings of insects and birds used for flying

The sequence of origin of life may be as first formation of nucleic acid (DNA and RNA) followed by amino acids to form protein. Chlorophyll evolved in plants to become autotrophic from chemoheterotrophic.

Protobionts that include coacervates and microspheres are involved in origin of life from inorganic substance. Coacervate and microspheres are separate combinations of molecules from surroundings that leads to formation of first life on earth.

There are many evidences that favor the organic evolution of life. According to this concept life originate from pre-existing organisms by evolution in cousr of time. Homologous and vestigial organs hit the uses of different organs in different organism for different purpose.