As scientists have learned more about atoms models of atoms, models of atoms have changed. One of the first atomic models was a solid ball, such as marble. What are two limitations of using a marble to model an atom?

A) The model is much harder to see than a real atom.
B) The model is not made of commonly available materials or objects.
C) The model does not move or behave like a real atom.
D) The model does not show the true size of an atom.

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.

What could happen if two base pairs on a strand of dna or switched