Dog and pig belongs to different species. The male reproductive cell or male gamete or sperm cannot fertilize with the female reproductive cell or female gamete or ova due to prezygotic barrier. The barrier could prevent fertilization, so that a zygote cannot be formed to produce hybrid.
Because at any time, you can find cells that are undergoing mitosis.
Scientists so far haven’t managed to figure that out .
Eukaryotic animals are always multicellular
The appropriate response is active transport. Active transport is the development of particles over a cell layer from a district of their lower focus to a locale of their higher fixation—toward some inclination or another deterring factor.
Active transport utilizes cell vitality to move them against an angle, polar repugnance, or other resistance.