Which principal part is this verb form?

(is) cutting

a.
present

b.
present participle

c.
past

d.
past participle

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.`

Describe three methods that can be used to improve photosynthesis

Rules and regulations for governing ancient people’s lives is called