Cell communication occurs among the cells in a multicellular organism. For each of the 3 examples of cell-to-cell communication, describe the communication that occurs and the types of responses that result from this communication

it is either c or d and i know for sure it is not a or b

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate