Is a cell membrane a ring, bilayer, or a chain?

It's a Bilayer

Explanation:

The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules. ... The cell membranes of almost all organisms and many viruses are made of a lipid bilayer, as are the nuclear membrane surrounding the cell nucleus, and membranes of the membrane-bound organelles in the cell.

hello there,

igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.