In a gasoline engine, fuel vapors are ignited by a spark. in a diesel engine, a fuel-air mixture is drawn in, then rapidly compressed to as little as 1/20 the original volume, in the process increasing the temperature enough to ignite the fuel-air mixture.
part a
explain why the temperature rises during the compression

Here's what I get  

Explanation:

ΔE = q + w

The compression cycle is so fast that heat doesn't have time to enter or leave the cylinder.

Thus, q is constant.

When you compress the gas, you are doing work on it and increasing the internal energy (mostly kinetic) of its molecules.

Temperature is a measure of the average kinetic energy of the molecules, so the temperature rises during compression.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.