If half the K-40 of a rock has
decayed into Ar-40, how old is
the rock?

Answers

Answer 1

Answer:

20

Explanation:

40:2=20


Related Questions

Fruit can be preserved to some extent by keeping in a dark, cool place. Suggest why this technique might work.

Answers

Answer:

because the cold is like a fridge and the dark preserves the fruit

Answer:

it may prevent access to animals because not only insect and bacteria like fruit

Which of the following facts about genes is incorrect?
A.A gene can code for a specific protein
B.A gene can exist in alternate forms called alleles
C.A gene undergoes crossing over during meiosis and can switch chromsomes
D.A gene that is very similar in sequence in a human and in a bacterium is probably a recent mutation.
E.If parents do not express a gene but their child does, that gene is probably recessive.

Answers

B. A gene can exist in alternate form called alleles.

Where do the nutrients go that decomposers recycle from dead plant and animal
matter?

Answers

Decomposes recycle dead plants and animals into chemical nutrients like the carbon and nitrogen that are released back into the soil, water and air.

Where are proteins digested?
1 Gall bladder
2 stomach
3 small intestine
4 large intestine

Answers

Answer:

2) stomach

Explanation:

Protein digestion begins in the stomach, where the acidic environment favors protein denaturation.

Answer:

Stomach

Explanation:

the person above is right, I chose small intestine and got it wrong

What is the current genetic diversity of koalas?

Answers

Answer:

low in modern conditions.

Explanation:

1.
DNA has the limited ability to repair itself when damage
occurs. What might happen to cause damage to the DNA in a
cell?

Answers

DNA Damage: Causes and Effects
The most significant consequence of oxidative stress in the body is thought to be damage to DNA. DNA may be modified in a variety of ways, which can ultimately lead to mutations and genomic instability. This could result in the development of a variety of cancers including colon, breast, and prostate. Here we discuss the various types of damage to DNA, including oxidative damage, hydrolytic damage, DNA strand breaks, and others.

What do you think medical professionals should do to prepare for when antibiotics don’t work any more?

Answers

Answer:

medical professionals should prepare for a backup plan i.e they should Always have other antibiotics in store

A biologist wants to measure the effect of gene flow between populations. Which of the following investigations will allow her to accomplish this goal?
A)An investigation that determines a change in allelic frequency of a wolf population by theimmigration of a wolf from another population.
B)An investigation that determines the amount of time it takes for genes from a bee to transfer to the flower it fertilizes.
C)An investigation that determines the causes of mutations in genes that one species of guinea pig transfer to another species of guinea pig.
D)An investigation that determines the rate at which an antibiotic prevents a virus from transferring genes to a cat.

Answers

Answer:

B

Explanation:

Cause I say so

The investigation that will allow a biologist to measure the effect of gene flow between populations is that a change in allelic frequency of a wolf population by the immigration of a wolf from another population. Thus, the correct option for this question is A.

What is Population?

A population may be defined as a group of individuals belonging to the same species living in the same area at a given time. The size, density, abundance, birth rate, death rate, dispersal, etc. are categorized as the characteristics of a population. These characteristics are known as demographic factors.

According to the context of this question, the process of gene flow can be determined by collating allele frequencies of populations. With this mechanism, if the two populations have increased variation in their gene pool, it expresses a lesser amount of gene flow because gene flow increases homogeneity among different populations.

Therefore, the correct option for this question is A.

To learn more about Gene flow, refer to the link:

https://brainly.com/question/3498897

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What is the name of a group of connected and related organisms?
A. Flow
B. System
C. Energy
D. Matter

Answers

The Answer is D. Matter

Answer:

system

Explanation:

7. Which of the following systems is NOT found in a flatworm:
a. Digestive system
b. Respiratory system
c. Nervous system
d. All of the above

Answers

Answer:

No. B

8 think so

I hope it helps ✌️

Explanation:

Parasitic flatworm do not have a digestive system because they don't digest there food. They just suck it when the upper gut muscles contract, suck it inside their body then gobble them up and then they're done sucking the nutrients from the food people eat.

Answer:

A. Digestive system

9th grade biology
Tell me the answer fast pls

Answers

The correct answers is Tundra

Suppose a family replaces ten 60-watt incandescent bulbs with ten 30-watt fluorescent lamps. If each light was used for 4 hours per day and the cost of electricity was 10.0 ¢/kWh, how much money would they save in a year? Explain your answer. (This question is for a science gizmo)

Answers

Answer:

so i have no clue but i recommend looking up "*name of gizmo* answer key* and looking in images. always works for me.

Explanation:

The order of amino acids determines the structure and overall function of a protein. (True or False)?

Answers

Answer: TRUE

Explanation:

tbh not 100% sure

Which of the following is true of adaptive traits? they give organisms an advantage when it comes to survival
organisms with adaptive traits survive longer
organisms with adaptive traits produce more offspring
all of the above

Answers

I’m sorry I don’t know but if I did I swear I would’ve answered! I really do hope you figure it out tho!

Scientists are monitoring the pH of oceans. Which of these are they most likely studying?

A. the population of polar bears
B. the health of coral colonies
C. the level of carbon dioxide in the air
D. the rise of sea level

Answers

Answer:

B. the health of coral colonies

Explanation:

Answer:

ANSWER is B , The health of coral colonies

What is so important about Earth's placement in the solar system?

A) It is exactly 93 million miles away, which is the magic zone for every star in the
universe
B) It's in the habitable zone - not too close and not too far from the sun
C) It's the third planet, and only #3 is considered "just right around any given star

Answers

Hi! Your answer should be B, the placement of Earth is just right in the third spot. If we were any closer the sun would burn us, if we were any farther then we could freeze, hope this helps!

What are new stars that are found in the spiral arms and formed from recycled dead star material known as?

population II stars

red dwarf stars

population I stars

brown dwarf stars

Answers

Answer:

population I stars.

Explanation:

A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.

It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).

The luminosity of a star can be defined as the total amount of light radiated by the star per second and it is measured in watts (w). Also, the apparent brightness of a star is a measure of the rate at which radiated energy from a star reaches an observer on Earth per square meter per second. The apparent brightness of a star is typically measured in watts per square meter.

Some of the examples of stars are; Canopus, Sun (closest to the Earth), Betelgeus, Antares, Vega etc.

New stars that are found in the spiral arms and formed from recycled dead star material are known as population I stars. Also, it comprises of association and clusters formed a million or billion years ago in the spiral arms of Milky Way galaxy.

A galaxy can be defined as a collection or group of many billions of stars and other planetary body which are existing independently.

Answer: population l stars

Explanation:

The body produces extra white blood cells after it has eliminated an invading organism. What
term is used to describe these "extra" cells?

Answers

The increase in extra cells is called leukocytosis. hope this helps!

An image of an influenza virus is shown. The spike-like structures that cover the virus are surface proteins.
What is the function of the surface proteins on the influenza virus?

Answers

Answer:

D. to remove a host cell's DNA

Explanation:

I hope that this helped you :D

Answer:

I got it right... this is a first choice D) to remove a host cell's DNA

Explanation:

thank you!

give me a mark for brainly

PLEASE HELP!.............

Answers

Answer:

Insect larvae and shrews

The answer is going to be a

Which of the populations shown in Figure 6 do you think is most likely to get bigger in size? Explain your reasoning.​

Answers

The middle because this is a mix of young and old which can get bigger

What is the
relationship between the raw materials and
the products in photosynthesis?

Answers

Answer:

Photosynthesis is the conversion of light energy into chemical energy by living organisms. The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose and starch

Explanation:

Will mark brainliest and give 15 points

Answers

Explanation:

Solar eclipse

-The moon is in-between the earth and sun.

-only lasts for a few minutes.

Lunar eclipse

-The earth is in-between the sun and moon.

-can last up too an hour

Hope this helps!!

Give an example of an adaptation found in three different plants or animals. Construct an explanation of how the adaptation helps each organism survive in its environment.

Answers

Answer:

race

species

restriction

correct me if I am not correct thank you

Can somebody please help me with all the question?

Answers

Answer:

no

Explanation:

Muscles cannot function without ATP. Review your knowledge of ATP by answering the followini
questions.
ATP molecules store and release_____.

Answers

Answer:

energy

Explanation:

hope  it helps.

Answer:

ATP molecules store and release energy.

Energy is released when ✔phosphate bonds are broken.

edge ✅⬇️

HOT PHONI
MOMRON
PRODUNA
A
The old strand of DNA reads TACGAATAG. Enzyme B makes the
new RNA strand:
OUACGAAUAC
ATG CITATG
AUG CUU AUC
AUGGUUUAUC
QUESTION 14
1 points
Save Answer

Answers

Answer:

The correct answer would be - AUGCUUAUC

Explanation:

The new mRNA strands are made by the process called transcription that involves an enzyme that helps to copy a segment of DNA or gene to produce a new RNA strand that encodes for the protein. In this process, a new RNA strand copied the complementary to the sequence of DNA strand. It means adenosine is copied into its complementary form uracil in RNA, Thymin to adenosine, cytosine to guanine and guanine to cytosine.

Original strands: TACGAATAG

new RNA strand: AUGCUUAUC

How does the carnivorous plant catch its victums?

Answers

Pitfall traps (pitcher plants) trap prey in a rolled leaf that contains a pool of digestive enzymes or bacteria. Flypaper traps use a sticky mucilage. Snap traps utilise rapid leaf movements. Bladder traps suck in prey with a bladder that generates an internal vacuum.

Answer:

They use special traps that are connected to them.

Explanation:

For example, the Venus Flytrap uses it's "mouth" to close on the fly. A sundew plant uses sticky spines to stuck to the bugs and slowly curls up and digests the bug.

Which of the following is NOT an example of a physical change?

Answers

Answer:

Solution : Combustion of Liquefied Petroleum Gas (LPG) is a chemical change. Because it is an irreversible reaction and new products, carbon dioxide and water vapour are formed and lot of heat is also produced during the reaction.

What conditions are necessary for rocks to melt?

Answers

Answer:

In explanation.

Explanation:

The rock is pulled down by movements in the earth's crust and gets hotter and hotter as it goes deeper. It takes temperatures between 600 and 1,300 degrees Celsius (1,100 and 2,400 degrees Fahrenheit) to melt a rock, turning it into a substance called magma (molten rock).

The rock can be melted when high pressure and high temperature are applied to it, and due to the compression relaxation, the rock melts. The different types of rocks need different temperatures.

What is the effect of temperature on different substances?

Temperature plays an important roles in different substances, such as high and low temperatures, each with its own set of tasks. The high temperature can melt the solid substance into a liquid, and further heating converts the liquid into gas. Because of the high pressure and temperature in the earth's core, the rock is in a molten state, but when it comes out of the earth's core, after solidifying, it converts into solid rock. The low temperature converts the liquid into a solid, and food preservation is carried out by this process.  

Hence, the rock can be melted when high pressure and high temperature are applied to it, and due to the compression relaxation, the rock melts.

Learn more about the temperature here.

https://brainly.com/question/10837981

#SPJ2

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