Which of the following statements are true? i. each white blood cell contains millions of hemoglobin molecules. ii. in a sample of blood, there are more red blood cells than white blood cells. iii. hiv destroys red blood cells. iv. all blood cells come from one pool of stem cells. a. ii and iv only b. i and iv only c. ii and iii only d. i, iii, and iv only e. i, ii, and iv only

Based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen

How does upwelling affect coastal fisheries? upwelling damages nutrient supplies at coastal fisheries as the warm, nutrient-rich surface water is replaced by nutrient-poor, cold water. upwelling damages nutrient supplies at coastal fisheries as the cold, nutrient-rich surface water is replaced by nutrient-poor, warm water. upwelling improves the nutrient supply at coastal fisheries as the warm, nutrient-rich surface water replaces the nutrient-poor, cold water. upwelling improves the nutrient supply at coastal fisheries as cold, nutrient-rich water replaces the warm, nutrient-poor surface water.