The picture above is that of a nucleus. the dark dense area is the nucleolus. what is its main function? < < < on this question the answer was wrong

According to the law of conservation of energy, energy can neither be created nor destroyed. if this is true, why is there less energy in the top of the energy pyramid than there is in the bottom of the energy pyramid?

Scientific method and data analysisa biology student wanted to determine if there is a relationship between resting heart rate and bodyheight. she gathered information from 12 classmates and constructed the table below.resting heart rate (beats per minute)student height (cm)155. 156156165180180190194195

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems