The gene. A trait is a characteristic of a person that can be passed on. But it is the gene, not the trait that is inherited
Spread of disease is density dependent because it is more severe the greater the population density as the disease would spread more easily. If there is low population density it would spread slower.
There are many answer you have to be specific
C. The brain sends messages to the spinal cord
processing information that is received from the stimuli receptors
sending out information so that the body can react appropriately to stimuli
coordinating reflexes and reactions to stimuli
