Flowering plants have flowers that allow for easy pollination via wind or animals. These plants are also able to disperse their seeds, using the wind to help carry the seeds away. Both processes are critical for reproduction.
Among the given choices, the only positive effect that may be thought off with the increase in level of CO2 in the atmosphere is the increase of plant growth. Carbon dioxide is an essential compound in the photosynthesis of plants. Therefore, the answer should be letter C.
Female gametes are called ova or egg cells, and male gametes are called sperm.
That would be the infamous yellowjacket.
