Eukaryotic, because there is a present cell membrane, organelles, and nucleus.
A tetrad consists of 2 homologous chromosomes each of which is made up of 2 sister chromatids
The planet closest to the sun is mercury and this is because the order of the planets in the solar system, starting nearest the sun and working outward is the following: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and then the possible Planet Nine. If you insist on including Pluto, it would come after Neptune on the list.
c. because only male repoduce sperm
