In the developmental history of mammalian heart, it is observed that it passes through a two-chambered fish-like heart, three-chambered frog-like heart and finally four-chambered stage. To which hypothesis can this above cited statement be approximated
Biogenetic law
Hardy Weinberg law
Lamarck's principle
Mendelian principle
Which of the following statements stands in favour of abiogenesis?
$I.$ Spontaneous generation
$II.$ Origin of viruses and microbes
$III.$ Origin of life from living organism
$IV.$ Origin of life from non-living organism
The correct combination is
Which of the following is the correct sequence of events in the origin of life ?
$I.$ Formation of protobionts
$II.$ Synthesis of organic monomers
$III.$ Synthesis of organic polymers
$IV.$ Formation of $DNA$ based genetic systems
Thick skull, cranial capacity about $1075$ c.c., low fore head, absence of chin and large canine were present in
According to the discovery made in $1980's$. $RNA$ can act like enzyme to assemble new $RNA$ molecules on $RNA$ template. Which of the following statements is not proved by this theory?
The greatest evolutionary change enabling the land vertebrates to be completely free from the water. Habitat was the development of