The building blocks of DNA are like alphabet letters, because they:
А: Are each associated with a particular sound
B: Can be used in a variety of languages
C: Each have an uppercase and a lowercase form
D: Spell out different instructions depending on their order

Help please

passing a magnet thought the

mixture , because iron gets attracted to magnet .

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.