Neutron stars have been collapsed by what?

supernovas
the sun
friction
gravity

Supernovas.

Explanation:

A giant star collapses and the electrons and protons combine to form neutrons.

Neutron stars were first detected by radio telescopes  and were call pulsars.

good one: produce hormones that plants grow.

bad one: the problem with organic matter is that while plant nutrients are needed for crop growth, they can also stimulate excessive growth of the wrong plants – mainly, algae.

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

mark as brainlest

gokuson