Brown eye color in fruit flies is caused by a variation in a gene. What are two possible sources of this genetic variation?

random mating

Explanation:

crossing over(or recombination) between chromotids or homologous chromosomes during meiosis

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.

trachea, alveoli, lung capillaries, arteries