Please help giving out brainlist!

"The higher the atomic number of group 1a elements, the lower the melting point"

This is what can be concluded from this table, but a more conceptual explanation would be that since we're going down the group of Alkali metals, the atomic radii increases, which makes the bond between the nuclei and the outermost shell weaker, thus less energy is required to break them, so their melting points will decrease.

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.

the answer is a and have a great day