The two structures that could be found only in plant cells are chloroplast and the cell wall. As these two structures are not present in the animal cells, therefore the chloroplast and cell wall are the two positive identifications of a plant cell under the microscope.
Answer:
cell membrane is the answer
Answer:
B) Styrofoam is a good insulator.
Explanation:
When talking about thermal energy, or a heat, insulator is a material that doesn't allow heat to pass through easily. On the other hand, a conductor is completely the opposite, it allows, quite successfully, transfer of the heat.
So, regarding ice cream, from these definitions above, we can conclude that insulators will prolong melting time, while, in the conductors, ice cream will melt rather fast.
Looking at the table, we see that Styrofoam had the longest melting time, which makes it quite successful insulator.