What is the density of an object with a volume of 12 mL and a mass of 38g? What is the mass of an object with a density of 0.29 g/mL and a volume of 176.5 mL?
What is the volume of an object with a mass of 42.6 g and a density of 6.73 g/mL?
What is the density of an object with a volume of 27 mL and a mass of 13.79?
What is the mass of an object with a density of 0.92 g/mL and a volume of 136.5 mL?

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.