1. Species 3.
2. Lost its toes.
3. Produces new individuals.
Step-by-step explanation:
1. The genetic sequence that is given here in this question has 6 codons. The species that are given has various combinations of genetic codons, but the species 3 has almost similar codons excepting the thymine being replaced by adenine in 3rd codon. So this is the nearest to the species that is found by scientist.
2. The evolution of horse has the greatest diversity ever seen by science. The horse has the five fingered toes in the Eohippus stage from which the size of toes began to shrink while the middle toe grew stronger and bigger, with absolute disappearance of four toes in Equus stage and the middle toe became the strongest as well as the biggest along with the main weight bearing one.
3. The meiosis is the reproductive cell division which forms The gametes. The gametes are formed by meiosis which involves the reduction of the chromosomes to half so that during fertilization, the gametes fuse to restore the main chromosome number of the adult. This division also involves the crossing over and independent assortment which leads to the communication of different parts of chromosome into the final gamete which leads to the variation in the final offspring. The final offspring produced has different characteristics then the parents.