You grow mesenchymal cells in Dish A and epidermal cells in Dish B. If you take the liquid medium only (containing no cells) from Dish A and place some of it into the liquid medium covering the epidermal cells in Dish B, you notice that it causes the epidermal cells to round up and thicken. What developmental concept does this example best describe

induction of epithelial cells by paracrine signaling from mesenchymal cells.

Explanation:

Mesenchymal stem cells can be found in bone marrow and are vital in making and the repairing or skeletal tissues.

Based on the information given in the question, the developmental concept that the example best describe is the induction of epithelial cells by paracrine signaling from mesenchymal cells.

it's c. (to reduce the greenhouse effect/carbon gasses)