Can someone help me please

Which describes interactions between substances and stomata during photosynthesis? check all that apply. oxygen enters stomata. oxygen is released through stomata. carbon dioxide enters stomata. carbon dioxide is released through stomata. hydrogen enters stomata. hydrogen is released through stomata.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

2. how is heavy water different from normal water