Brainlies ! 1. which of the following indicates that an endothermic reaction has occurred? heat is released water is formed salt is produced temperature decreases 2. scientists have developed a new drug known to cure a previously incurable disease. what best explains if the new drug is a compound or not? it is a compound because it will be able to cure a disease. it is not a compound because it was developed by scientists. it is a compound because compounds make all types of matter. it is not a compound because compounds make up only living things.

1st of all, the hey neighbor guy is way off, you can google it. Part 1 the answer is D: Temperature decreases. i dont know part 2 but do not listen to the other guy for part one.

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.