What do scientists know about the future of the universe? check all that apply. that dark matter exists what dark matter is made of why the expansion of the universe is accelerating that invisible matter must be influencing the rotation of galaxies that galaxies spin faster than they should based on visible matter

The correct answers are:

•that dark matter exists

The existence of dark matter (invisible matter) is generally accepted and it is believed that this matter is about 85% of the total matter in the universe and it is composed of undiscovered subatomic particles.

•that invisible matter must be influencing the rotation of galaxies

Dark matter is crucial for explaining why galaxies can spin without tearing themselves apart.

gold i'm pretty sure i might be wrong

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.