All of the following are true of hypersensitivity except
a. it occurs in the presence of an antigenb. it is synonymous with allergyc. it occurs when an individual is exposed to an allergen for the first timed. it is due to an altered immune responsee. it requires previous exposure to an antigen

The correct option is C.

Explanation:

Hypersensitivity is the process by which the immune system produce excessive reactions when exposed to certain antigens. There are four types of hypersensitivity, type 1 to type IV.

For hypersensitivity to occur some conditions must be fulfilled. For instance, an antigen must be present, the immune system must have been exposed to the antigen previously, etc. Hypersensitivity does not occur when the immune system is been exposed to an antigen for the first time.

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.

b because they naturally adapt to their environment plz mark brainliest

explanation: