How does a law differ from a theory?
a law is a theory that has been proven to be true and universal.
a theory is a group of hypotheses that prove a law is true.
a law is a statement of fact, but a theory is an explanation.
a theory is a proposed law that has not yet been peer reviewed.

A law is a statement of fact, but a theory is an explanation.

Explanation:

A law can be based upon the already proposed facts which does not include any kind of verification or testable evidence. But the theory includes the detailed explanation of the facts and is generally based on the testable evidences obtained after application of suitable methodology.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.