Heat is needed to change solid to liquid even to gas!
<span>Carrying capacity is the number of organisms an ecosystem can support. It is the maximum size of a population that can survive in the ecosystem. If the animals reach the carrying capacity, the population may crash. As the consequence, the number of animals will decrease due to predators or diseases.</span>
I believe this is a double replacement. As you can see none of the chemical symbols are missing, there just "replaced".
I think B. As an idea is just a way that could be possible
Column is the answer hopefully this helps
