Answer: Chromosome
The polynucleotide DNA strands are wrapped on circular proteins called histones which then are condensed into a structure called chromosome.
<span>linnaen classification was 2 kingdom classification,named plantae and animalia, on the basis of nutrition w.h.whittaker included 5 kingdom classification monera,protista,fungi,plantae,animalia.
so option b)plant and animal kingdom is right,
actually linnaeus put all protists,monerans,and plants in one kingdom plantae,though they have different cell structure,and mode of nutrition.</span>
The correct answer is they are produced by cyanobacteria.
Stromatolites are being produced by cyanobacteria.
Stromatolites are termed as layered mounds, which have columns and also sheet like rocks which are originally formed with growth of layers.
Lichen stromatolites is a type of stromatolite which is formed by layered structures rocks and they are formed above water.