If a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

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.