The 30 million years ago, because its the closest one to us. Wait is there a picture to it ?
No it is not as it lacks internal cell membranes.
Due to the linneaus system of classification scientist were able to identify organism name , group via standardized system . They have found similarities in the organism like DNA / RNA ( genetic composition), embryonic development etc . so that they can study a organism completely . With the help of this system of classification scientist were able to give a particular name to a organism which is standardrized in the whole universe. It makes easier to all to identify an organism , otherwise different places have different name for a particular species.
I think it's D because I suppose that 'all its chromosomes' equals diploid
