Small, nonpolar hydrophobic molecules such as fatty acids a. pass readily through a
membrane's lipid bilayer
b. diffuse very slowly through the lipid bilayer
c require special channels to enter a cell
d. are actively transported across cell membranes
c. must enter the cell via endocytosis

a. pass readily through a membrane's lipid bilayer

Explanation:

Molecules or substances move to and fro the cell via the cell membrane, which is selectively permeable i.e. controls the passage of molecules in and out the cell.

Small, non-polar hydrophobic molecules such as fatty acids will not be repelled by lipid-containing cell membrane, hence, enters the cell via SIMPLE DIFFUSION. This means that they pass readily through a membrane's lipid bilayer without aid. Fatty acids are able to do this because they are a class of lipids and are soluble in lipid layer of the cell membrane.

a. pass readily through a membrane's lipid bilayer

Explanation:

Small, nonpolar hydrophobic molecules such as fatty acids pass readily through a membrane's lipid bilayer.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the glands which are associated with each description is given below: