The biggest problems, with most important first, are: human numbers, carbon-dioxide-driven warming and acidification, overfishing, and plastics.
<span>Radiometric dating such as carbon 14, Uranium 238, 235, and 234, Thorium 232, Rubidium 87, and Potassium 40. This is not an exhaustive list. Each of these different isotopes have a different half life, so they can be used to measure different ages, from million to billions of years.</span>
That would be telophase, the last stage of mitosis or meiosis. The cytoplasm divides.
<span>The angular size of the moon in our sky is almost exactly the same as the angular size of the sun in our sky. This can be seen and noticed during a full eclipse, by some remarkable coincide, the Earth's moon, from our point of view, is at the perfect distance from Earth in relation to the sun, to have almost matching sizes, allowing for the complete blocking of light when the moon and sun align.</span>
