What are the key differences of high-mass
stars and low-mass stars at
the main sequence stage?
Which group stays in the
main sequence stage the
longest?
Why do you think that is?

The theories on the expansion of galaxies maybe re-examined to strengthen science should not be tested to strengthen science will weaken scientific knowledge if they change will become laws if they don't change

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?