1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jeka57 [31]
3 years ago
9

3. If a rock was determined to be around 3.9 billion years old how much Potassium 40 would be left in that rock sample?

Biology
1 answer:
son4ous [18]3 years ago
5 0

Answer:

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.

]

Explanation:

You might be interested in
How are these four types of protists similar to animals? how are they different?
Marizza181 [45]
Oklololololololololololololololol
6 0
3 years ago
What is double fertilisation
Phoenix [80]
Double fertilization is a complex fertilization mechanism of flowering plants. This process involves the joining of a female gametophyte with two male gametes. It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower.
6 0
3 years ago
Read 2 more answers
Your classmate will be doing a presentation on evolutionary medicine in science class. What is he likely to discuss?
Svet_ta [14]

Your friend will talk about the definition of evolutionary medicine, and there by understanding the health and diseases

Explanation:

  • Evolutionary medicine is the understanding the health and diseases using the evolutionary theory
  • Evolutionary theory gives an idea of the heritable and morphological changes in the organism.
  • Today, the field of research on evolutionary medicine is advanced to the molecular and psychological mechanism of health and diseases.
  • Hence, your friend will talk about the evolutionary understanding of the health and diseases from the lens of the evolution of species. To create an understanding of the evolutionary medicines there need to ab understanding of the heath and diseases of previous ages.
8 0
3 years ago
A global examination of the diversity of tunicates, a marine animal that is related to other chordates, is shown in the graph he
Tju [1.3M]

Answer: A) Tropical regions have more available niches into which new species can occupy.

Explanation: USATestPrep

3 0
2 years ago
What organs are in the cardiovascular system?
Mazyrski [523]
Heart Blood vessels. (Arteries, Capillaries, and Veins)
8 0
3 years ago
Other questions:
  • what creates more pressure check all that apply A.going to a lower altitude B.Gases with less kinetic energy C.Gas molecules mov
    11·1 answer
  • Why do high-energy electrons need carrier molecules?
    6·1 answer
  • The cells that make up plant leaves are specialized in structure and function to allow them to produce food from sunlight in the
    12·1 answer
  • How does over-hunting cause a species’ population to decrease? A. Most of the surviving individuals move away. B. Too few indivi
    6·2 answers
  • What is the term for the protective wall that helps bacteria survive unfavorable conditions? endospore sporangia aerobic wall bo
    5·2 answers
  • "what evidence exists that some of the asteroids were geologically active in the distant past"
    7·1 answer
  • 13. The allele that results in the absence of a tail is autosomal recessive. From which parent do
    8·1 answer
  • Which statements describe long-term environmental changes? Check all that apply
    7·1 answer
  • 1. Why is Carbon important?
    7·1 answer
  • Anabolic steroids are used to build muscle mass quickly. Why are they called “anabolic?”
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!