Please help And no links please The graph below shows the radioactive decay of a material.

If the original mass of the radioactive material was 500 grams, what will be its mass
after 4 billion years?

12.50 grams

25.50 grams

10.25 grams

31.25 grams

I’m about to start crying

Drag the correct tiles to the image. not all tiles will be used. the diagram is a schematic representation of the electron transport mechanism in mitochondria. label the diagram to complete the model.

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

In which state was more than 100 billion tons of coal mined in 2005?