The first stage of photosynthesis gives off as a waste product. water carbon dioxide oxygen all of the above

Oxygen

Explanation: There are two stages of photosynthesis, i.e.

1. Light dependent reaction-Here light energy is absorbed and converted into chemical energy. Here, breakdown of water molecules take place, which leads to release of electrons, protons and oxygen molecules.

2. Light independent reaction-Here the chemical energy formed during the former reaction is used to reduce carbon dioxide into glucose.

the answer is b.) hydrogen bonds between bases.

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