Which of the following statements about horizons is true?
a.
they are characterized by whether they are solid, liquid, or gas.
b.
they are represented by roman numerals.
c.
all soils have completely different horizon patterns.
d.
they are defined by their different physical features.
can any one tell me

c. All soils have completely different horizon pattern.

Explanation:

A soil horizon can be define as the horizontal layer of the soil that lies parallel to the surface of earth. There are distinct soil horizons develop in the soil depending upon the color, texture, composition of the soil on the basis of organic matter and mineral content. With the difference in the soil the soil horizon also varies.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

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.