Which four elements comprise approximately 96% of our body weight?

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

All ova contain sex chromosomes corresponding to: x y xx xy

What happens when a plant is losing too much water through transpiration? question 14 options: stomata open stomata close guard cells swell respiration increases