2. Explain how immunity works, with reference to the concepts of artificial, natural, active and passive.

PLEASE ANSWER! :(

Artificial immunity can be active or passive. Immunity: Natural immunity occurs through contact with a disease causing agent, when the contact was not deliberate, where as artificial immunity develops only through deliberate actions of exposure.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs