C.<span>trees going dormant in winter to survive unfavorable conditions</span>
If a researcher electrically stimulates the reticular formation in an animal, the animal will immediately wake up and be alert. Its purpose is to have some control of sensory signals and thus has the ability to alert the body when it is tired or needs to be awake.
Selective permeability is when a cell membrane allows some molecules or ions to pass through it, but not others.
An energy pyramid is helpful in understanding the relationship between food and energy, because the most energy (generally grass, or plants) is at the bottom, and meat eating predators are at the tippy top (less energy). Producers, primary consumers, secondary consumers and tertiary consumers are all on the energy pyramid. I hope this was helpful:)
