Which sentence from the passage supports the inference that some scientists have challenged
Newton's universal theory of gravity?
O 1. "Nearly three centuries would pass before the
world would host a comparable scientific
genius." (Paragraph 1)
2. "Newton's view of gravity might be called the
great equalizer." (Paragraph 3)
3. "Regardless of physical composition, everything
exerts as well as feels the force of gravity."
(Paragraph 3)
4. "This success gave Newton's theory unequivocal
support until the early part of the twentieth
century." (Paragraph 4)

3. "Regardless of physical composition, everything exerts as well as feels the force of gravity." (Paragraph 3)

Explanation:

The sentence from the passage supports the inference that some scientists have challenged Newton's universal theory of gravity is sentence 3.

This is because, the scientists believe that irrespective of the physical composition of the material, everything feels the law of gravity.

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.