When one part of a car fails, the rest of the car doesn’t run properly. explain why this happens in terms of systems.

The car is a system that has many parts. In a system, all of the parts function together to make the system work. If one part breaks down, the rest of the system doesn’t function properly. An incorrect or missing input results in the wrong output. For example, if the car battery is dead, the engine won’t turn on, and the car won’t move.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

you know they are heterozygous for a trait because they have it as jj or jj.