Use the crossover method to find the chemical formula of a calcium oxide

CaO

how:

since its an iconic compound (metal(Ca)+non-metal(O)=iconic(CaO) we have to take account the charges

so;

now we will cross them

since both the values are same will cross it out.

hence: CaO

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.