Limulus is a living fossil.A living fossil is a living species (or clade) of organism that appears to be similar to a species otherwise known only from fossils. Normally the similarity is only a superficial physical resemblance between two different species, one extinct, the other extant.

 ‘Homo erectus’ is the zoological name of Peking man.

 Theory of spontaneous generation was supported by Van Helmont. He insisted that knowledge of the natural world could be obtained only by experimentation.

The gradual, more or less continuous change in hair colour from one group of aborigines to another is not random or haphazard. There probably is a progressive gradation because there are different evolutionary pressures from one region to another.

This distribution pattern is most likely the result of migration of groups of red-haired people into areas where other hair colours pre-dominated. However, it could also result from discriminatory marriage partner selection.

The International Society of Blood Transfusion (ISBT) identifies about 30 major blood group systems, including the ABO and Rh systems.

The process of origination of life on Earth was experimentally shown by Urey and Miller.

Weismann proposed germplasm theory.

This trait is quantitative in nature. 

  Forelimbs of frog, lizard, bird and man have some evolutionary relationship. These are homologous organs.

 A random change in the frequency of alleles in any population over several generations due to errors in the gametes is called genetic drift.

 The wings of an insect and a bird are an example of analogous organs.

 The correct answer is option no.4.

 Epitasis is the inhibition of the expression of one gene by another non-allelic gene

 Vermiform appendix is a vestigial organ in humans.It is a blind-ended tube connected to the cecum, from which it develops embryologically. The cecum is a pouchlike structure of the colon, located at the junction of the small and the large intestines.