Please help
According to Hess’s theory, what might happen if the magma under a mid-ocean ridge cools?

The magnetic stripes might reverse direction.
The deep-ocean trench might become deeper.
The crust at the ridge might form more quickly.
The plates on either side of the ridge might stop moving.

Why do you suppose the structural polysaccharide cellulose does not contain branches? why do you suppose the structural polysaccharide cellulose does not contain branches? branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby decreasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby increasing the rigidity and strength of the microfibrils. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby increasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby decreasing the rigidity and strength of the microfibrils.

How do you know when a chemical reaction has occurred

Helium decays to form lithium. which equation correctly describes this decay?