Adenine, guanine, thymine, cytosine. Thymine matches with adenine and cytosine matches with guanine
Sunflowers due to the fact that the top of it is entirely of nectar
Because it has the ability to get light, photosynthesis would happen. Since it is in an airtight jar, it will use all the CO2 in the jar until all the CO2 is gone and there is only Oxygen left. Photosynthesis's rate will decrease rapidly. After that, the plant will have no more energy since there is no CO2 to allow it to keep with photosynthesis, so it would die off.
You might put harmful toxins in the beach or into the ocean which would kill wildlife