Answer:
Index fossils represents the fossils of the organisms that lived in a particular geological time zone. The index fossils defines a geological time of a dead organisms. Index fossil ensures that a correct order of geological time appears in a fossil record. The index fossils of organisms that lived for a short period, were abundant and widespread geographically.
No it does not follow a pattern
Answer:
1.Two products are obtained as a result of double fertilization.
2 There are chances of polyembryony, and the plant has better chances of survival.
3.Double fertilization gives rise to an endosperm that provides nourishment to the developing embryo.
4.It increases the viability of the seeds of angiosperms.
5.It utilizes both the male gametes produced by the pollen grains.
