What do X and Y chromosomes affect? O A. Whether someone is a female or male O O O B. How many parents a person has. C. The shape of a person's thumb. O D. Whether earlobes are attached.​

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a.cornb.ironc.cottonseedd. vitamin a

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries