Describe the effect of tropical sprue on the surface area of the small intestine

People with tropical sprue do not absorb nutrients properly, especially vitamin B12 and folic acid. Normal small intestines have fingerlike projections called villi that provide more surface area for nutrients to be absorbed. In people with tropical sprue, these villi are flattened, making absorption difficult.

Explanation:

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".