Are really healthy for your body
The correct option is: GRATINIC ROCK IN THE OCEAN FLOOR.
Sea floor spreading refers to the process by which molten materials add new oceanic crust to the ocean floor. This process occurs slowly across the earth's middle ocean ridges. Harry Hess formulated an hypothesis to explain the phenomenon of sea floor spreading and all the above options support his hypothesis with the exception of option C.
sunlight and nutrient availability
The polar bears are going to fight for the different resources that will become limited in their environment
This process is called pollination. It is done by pollinators, like bees, taking pollen from one flower and bringing it to another flower.