Why can observed changes in population size differ from the trends predicted by a logistic population growth model?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?