Define the following terms related to the operation of the immune system. immunological memory:

specificity: .

self-tolerance: .

Cartificial intelligence

Plants take energy from the sunlight with the of chlorophyll so the plant starts the food chain. then an herbivore eats the plant and gets its energy.then a carnivore or a human eats the herbivore and gets its energy. : )

When scientist examine data such as historical documents, they are using the "scientific methods"