Both gandhi and king how many years passed between the delivery of the two speeches

What is the present participle from of prove

Which best summarizes what scientists learned about how microbes benefit the human body? they are part of a normal human ecosystem. they have become less harmful to humans than they used to be. they process nutrients, fight disease, and accommodate change. they humans overcome the effects of antibiotics.`

Can someone translate the swahili word 'cheo' for me ? i do not understand.