An experiment would have a low validity if it had .
A. no controls
B. been repeated
C. been replicated
D. a clear procedure

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds

c is the answer to this question. altitude affects the weather because air molecules evaporate.