I'm sorry, but I would need to see the options.
Some isotopes, however, decay slowly, and several of these are used as geologic clocks. Dating rocks by these radioactive timekeepers is simple in theory, but the laboratory procedures are complex. <span>All methods rely on the fact that certain elements (particularly uranium and potassium) contain a number of different isotopes whose half-life is exactly known and therefore the relative concentrations of these isotopes within a rock or mineral can measure the age.</span>
Answer:
C) releases oxygen into the air
Explanation:
Stomata are the minute openings present in the epidermis of leaves. Plant open stomata to take in carbon dioxide gas from the air which in turn is fixed into organic compounds during the process of photosynthesis. Oxygen gas is the by-product of photosynthesis. Plants release oxygen from stomata into the air. Therefore, dermal tissues in leaves have stomata and one of their functions is to release oxygen into the air.
