Answer:
A
Explanation:
This is because those items are the actual required ones when it comes to building the molecule DNA.
They form memory cells in which those cells remember the same pathogen for faster antibody production, in aid of future infections.
Plants absorb carbon dioxide,water and sunlight to make their own food,grow and release oxygen through photosynthesis. They're a huge part in keeping our air clean. The carbon becomes part of the plant. Plants that die and are buried may turn into fossil fuels made of carbon like coal and oil over millions of years. When humans burn fossil fuels, most carbon enters the atmosphere as carbon dioxide.
Answer should be <span>Thermodynamics </span>
