Answer: 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:
A. Seafloor splits open creating a large trench
Explanation:
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The plant
cells vacuole is larger compared to the animals cells' because the plants
vacuoles takes up 90% of the cells volumes. Vacuole stores food for the
organism. In this case since, plants manufacture their own food, it is
necessary for it to have a large storage space or a large vacuole.
Hypothalamus
pituitary gland
thyroid
parathyroids
adrenal glands
pineal body
reproductive glands (which include the ovaries and testes)
pancreas.