Topic: Half-Life
Plutonium-239 has a half-life of 24,100 years. How long will it take a 1-kilogram sample to decay to 125 grams?

Options:

12050 years.

24100 years.

48200 years.

72300 years.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

thats not even an aswer choice

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.