The main difference between autosomes and sex chromosomes is that autosomes are involved in determining the somatic characters of an individual and sex chromosomes are involved in determining the sex and the sex-related hormonal traits.
During meiosis the male XY sex-chromosome pair separates and passes on an X or a Y to separate gametes; the result is that one-half of the gametes (sperm) that are formed contains the X chromosome and the other half contains the Y chromosome. ... The X chromosome, being larger, carries many more genes than does the Y.
Most animals in Animalia have backbones, but not all. The correct answer would be C, because all organisms in Animalia are heterotrophs which means that they depend on other organisms (like animals and plants) for food.
