Chloroplasts are organelles specialized for photosynthesis. Animals do not photosynthesize; therefore, they do not need chloroplasts.
Because warm air rises up so it's warmer on the top floor.
It is not a combination of innate and learned behavior, because the the person is naturally the way he/she is. Human behavior can be common, unusual, acceptable, or unacceptable. Humans evaluate the acceptability of behavior using social norms.
