Your answer should be A. Nucleolus.
Hope this helped!!!!! :D
B. is the answer hope this helps
<span>The type of biological interaction when bears and coyotes may fight over the prey is called competition. Competition is an interaction between the members of the same or different species in which they compete for resources. If resources, such as food, are limited and several species depend on these resources, they must compete to win more resources for themselves.</span>
Explanation:
1. The materials are physically combined because all of the materials including the sand, salt, and iron fillings are their own substances and they maintain their original form. This is a mixture and they aren't chemically combined.
2. To separate each of the materials physical means would be used because since they're their own individual substances and have kept their original form they're mixed and not chemically combined.
3. The iron and oxygen atoms in rust are chemically combined because they are no longer individual substances and haven't kept their original form, so therefore they're a chemical combination.
