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:

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.