In the later 1800s, the brilliant french chemist louis pasteur worked with chicken cholera, passing the disease agent from sick to healthy chickens. he suspended his research and went on vacation for several weeks. when he returned, the old cholera culture he gave to healthy chickens failed to kill them. he assumed his culture was bad and injected these same chickens with a fresh culture of chicken cholera. these chickens remained healthy while new chickens injected with the fresh culture of chicken cholera rapidly became sick and died. from our current knowledge of immunity, how would these observations be explained

immunization

Explanation:when L Pasteur passed the disease agent in healthy chicken, the agent induced formation of antibodies but the infectious agent was weak and attenuated to cause death. Therefore when fresh cultures were introduced in the same chicken, the already present antibodies opposed and destroyed these infectious agents and the disease was prevented. This process is named vaccination

which colony was founded, in part, as a place for english debtors?

a) georgia

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.