What produces acid, oil, and an antibacterial substance to defend against pathogens?

The Answer is A = skin on edg 2020

Explanation:

our skin fights pathogens the most because it is the biggest part of us that fights them off. Our skin is made of tightly woven cells that fight against diseases and sicknesses such as the flu, cold and co-vi 19

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.