Evolution And Natural Selection

Cynognathus is a fossil that is considered a connecting link between reptiles and mammals. It exhibits features of both reptiles and mammals, and is an important part of the evolutionary chain.

Subspecies are populations of the same species that are geographically isolated and show minor morphological or genetic differences. They can interbreed with other members of the same species but not with other species. Hence, option 1 is incorrect.

Analogous organs are those that perform the same function but have different structures and origins. An example is the wings of a bird and an insect, which both help in flying but are structurally different.

The Cosmozoic Theory was proposed by Fred Hoyle, not Aristotle. Aristotle is associated with the concept of spontaneous generation, not the Cosmozoic Theory.

- First life forms were anaerobic heterotrophs (no oxygen).
- Chemoautotrophs appeared next, using inorganic chemicals.
- Then came anoxygenic photoautotrophs (photosynthesis without oxygen release).
- Finally, oxygenic photoautotrophs evolved, contributing oxygen to atmosphere.

Ernst Haeckel was the first to use a tree diagram to illustrate evolutionary relationships. His work laid the foundation for modern phylogenetic trees used in biology.

Nonfunctional pharyngeal pouches are present in the early embryonic stages of amniotes and are believed to be a vestige of their aquatic ancestors, as they are involved in respiration in aquatic organisms.