I believe you're looking for "invasive species"
The answer is c because curies release energy from the radiation
Except: Cells need energy to survive.
That's the Answer.
The anthers are in the elevated position so that the pollinators will be attracted towards it, and that the pollen grains are easily carried away by the agents of pollination. The proper pollination is essential for the process of fertilization.
Hope this helps:)