Answer:
In uranium-lead dating, for instance, the radioactive decay of uranium into lead proceeds at a reliable rate. Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old.
And that's how after rounding we know that earth is 4.5 years old.
The answer to your question is c.
Answer:
For basic fertility testing and to evaluate ovarian reserves, you need to have the blood test on day 3 of your menstrual cycle (day 1 is the day your period begins). However, most doctors are OK with the test being done on any day between days 2 to 4.
Explanation:
Answer:
a) 1 & 5
Explanation:
For a pendulum bob, it is customary to call the lowest position the reference position or the zero level. So when the bob is at the equilibrium position
