The Genomes of Arabidopsis Thaliana,a Small Member of the Mustard

The genomes of Arabidopsis thaliana,a small member of the mustard family of plants,and rice,Oryza sativa,have been sequenced.The findings include

A) the genome for each is almost identical,indicating that they diverged in the fairly recent past.
B) they each have very high copy numbers (slightly divergent copies of a gene) ,probably indicating episodes of polyploidy and/or segmental duplication.
C) repetitive DNA,including retrotransposons,was a very small proportion of both genomes.
D) more than 90% of the genes in each were particular to plants and not found in animal or fungal genomes.