Which best explains how gravity contributes to the formation of layers in protoplanets? Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.
Gravity causes materials to undergo radioactive decay, which produces heat and leads to the melting, sinking, and rising of materials.
Gravity absorbs heat, which cools materials and causes them to sink and rise.
Gravity releases heat into space, which cools materials and causes them to sink and rise.

it a Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.

Explanation:

its A in the 2020 test

Explanation:

just took the test

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.

b) the inside picture would look at a very high temperature in a very low ph