Tissues
Tissues are somewhat more complex units than cells. By definition, a tissue is an organization of a great many similar cells with varying amounts and kinds of nonliving, intercellular substance between them.
Answer:
option A is correct
Explanation:
when atoms in the solid state are heated they gain energy and start vibration due to which solid molecule lose their rigidity and are converted into liquid by the gain of energy
Interactions may be commensalism, mutualism, or parasitism.
