The potassium remaining is 1/4 of the original, so two half lives have passed.
One half life = 1.25 billion years
Two half lives = 1.25 x 2 = 2.5 billion years
The tools are 2.5 billion years old.
I am thinking D. But I am not sure that it is the answer.
Answer:
Land breezes and sea breezes both are breezes, that is how they are similar.But they are different because one breeze is blowing from the sea to the land also called a "sea breeze",and one breeze is blowing from the land to the sea also called a "land breeze"
Explanation:
Hope it helps! :)
The development of offspring takes place inside the UTERUS
