At the boiling temperature, adding heat<span> energy converts the liquid into a gas WITHOUT RAISING THE TEMPERATURE. ... The same thing </span>happens<span> when a solid changes into liquid. For instance, ice and </span>water<span> can exist together at the melting temperature. HOPE THIS HELPS :)</span>
Answer: 
Explanation:
The heat (thermal energy) absorbed by the iron skillet can be found using the following equation:
(1)
Where:
is the heat (absorbed)
is the mass of the element (iron in this case)
is the specific heat capacity of the material. In the case of iron is 
is the variation in temperature
Knowing this, lets rewrite (1) with these values:
(2)
Finally:
I have no clue sorry maybe try applying the answers and questions then I'll answer for u
Answer:
Their experimental design lacks control group
Explanation:
Based on what I read, the scientists don't have a control group as one of the main groups thus they cannot, in scientific sense, say that the medicine is better or worse. You always need a control group receiving no intervention because then we can compare groups and assess the effectiveness of that intervention (in our case if we had control group vs people who received the medicine, we could see if the people who received the medicine had improved condition etc when compared to participants who did not receive anything)
