Substances can move across the plasma membrane in two different ways—actively or passively. this activity will you determine whether transport mechanisms actively or passively move substances across the membrane.
true / false.

TRUE

Explanation:

The substances are transported into and out of the cell through active and passive transport

ACTIVE TRANSPORT

The substances are transported with the expenditure of energy against the concentration gradient

example

The sodium-potassium ion pump that exchange the ions in the cell with the help of energy given by ATP

PASSIVE TRANSPORT

The transport of material without any energy ,with the concentration gradient

example

The movement charged ions across the membrane i.e sucrose

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this