What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
Answer: C, It will go up gradually then and then level off.
Explanation: Without predators to hunt them, the prey population will rise until there is not enough food to sustain them all, meaning their population will cease to grow.
I’ve tired I’m sorry I don’t know
Answer:
cells are the basic building blocks of living things
Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs.
