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Yes, melting typically requires an input of energy in order to overcome the forces holding the solid together. This energy breaks the bonds between the particles in the solid, allowing them to move more freely and transition into a liquid state.
Melting ice absorbs thermal energy from its surroundings in order to break the bonds between water molecules and transition from a solid to a liquid state. This added energy increases the temperature of the ice until it reaches its melting point, at which further energy input will cause the ice to fully melt into liquid water.
First . . . then . . . last
Yes, a second order consumer is typically a carnivore. Second order consumers feed on herbivores, which in turn feed on plants. This places them higher in the food chain and indicates that they primarily consume animal matter.
An increase in pressure generally raises the melting point of a substance, as higher pressure forces particles closer together, making it more difficult for them to move into a liquid state. Conversely, decreasing pressure tends to lower the melting point, allowing particles to move more freely into a liquid state.