Answer:
Innate immunity is a non-specific immune system which provides defence against any pathogenic microorganism in early stages. It includes physical barrier such as skin, chemical barriers such as saliva, tears, et cetera, phagocytic cells such as macrophages, et cetera.
Acquired immune system is the one which develops after exposure to pathogen or antigen. It is highly specific in nature. It includes B-lymphocytes and T-lymphocytes. It includes the production of antibodies.
Vaccines are used to develop acquired immunity in people. The process is termed as vaccination or immunisation. Heat-killed or weakened pathogen or antigen is inserted into a person after which a person develops antibodies and memory cells against that pathogen or disease. So, the immune system acts more vigorously against that pathogen in secondary infection.
Thus, a person becomes immunised.
Answer:
Explanation:
Los inicios de la agricultura y la ganadería se remontan al Neolítico. Las actividades depredadoras, como la caza y la recolección, fueron sustituidas poco a poco por otras de carácter productivo como la domesticación de animales y el cultivo de la tierra. Así las sociedades fueron abandonando el nomadismo poco a poco para convertirse en sedentarias y productoras de alimentos
Carbon is a essential element for all life on earth. The primary function of the the Carbon Cycle is to exchange carbon throughout earth between the atmosphere,oceans,ecosystems, and geosphere. If the Carbon Cycle was to fail, then life on earth would begin to breakdown causing an end to all life on earth.
Hope this helps :)
Is it C or d?? Ima go with C