Wavy bands of light and dark minerals visible in gnesis bedrock probably formed from the ?

1) cementing together of individual minerals grains

2) cooling crystallization of magma .

3) evaporation of an ancient ocean.

4) heat and pressure during metamorphism

it is number 4 heat and pressure during metamorphism

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.