What is measuring the age of fossils in years called?

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight