Explain how a person can be a carrier for a particular disease and yet not have the disease. is this true for all people who are carriers?

Hi,

so a person can be a carrier of a disease but not have it, and no its not true for all carriers some carriers may not have that disease at that moment but can catch it later on in life.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

geologic time scale (for gradpoint) =)