What’s the difference between side A and Side B of the apparatus shown in Figure 7-10

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist