Answer:
The amount of substance present in a certain sample can be calculated through the equation,
A(t) = A(o)(0.5)^(t/h)
where At is the amount now, Ao is the original amount, t is the number of years and h is the half-life.
For a substance to at most 50% of the original amount, we get the half-life value.
At/Ao = 0.5 = 0.5^(4.5/h)
h = 4.5 billion.
ok the answers are simple:
Parent Isotope Currently Accepted Half-Life Values: is the first one uranium-238 4.5 billion years
Earth is approximately 4.5 billion years old. Given this information and the data in the table, which of the following isotopes could today contain less than 50 percent of its parent isotope: uranium- 238
a sample of matter breaks down into two kinds of atoms. Was the original sample an element or a compound?
Answer:
element
Explanation:
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Both osmosis and diffusion require energy and are considered active transport.
A) True
B) False
By controlling the substance that entered and leave the cell the cell membrane helps maintain homeostasis in the cell.
A) True
B) False
Water can flow freely into a gummy bear. What is the term for movement across a cell membrane that does not require energy?
Which of the following is NOT a characteristic of urban sprawl?
Question 2 options:
automobile dependency
high rise buildings with ground floor businesses
low density development
strip malls
Strip malls is not a characteristic of urban sprawl. Urban sprawl can be
defined as the rapid expansion of an area with very little concern for urban
planning.
Strip mall is not a characteristic of urban sprawl because these structures
are regarded as a type of mall which can be erected anywhere in any part of
the world.
There is little concern for urban planning because the development is
always of low density. Other characteristics of urban sprawl include:
Automobile dependencyHigh rise buildings with ground floor.Read more on https://brainly.com/question/14212781
What process is being shown by water being given off from each bond site? Give both names for this process
Answer:
Bond Formation
Explanation:
When a bond is formed, energy is commonly released as well as sometimes byproducts being formed. Many of the most common kinds of bonds are formed using water molecules or giving off water molecules.
Why is grass classified as a plant
(science)
Can anyone describe the courtship ritual of wolves, it's a science thing. But only just describe the part where the male shows off to the female, please don't write anything after that.
Answer:
The Male may bow to the female, toss and tilt his head, and lay his legs over her neck in what could only be described as a flirting manner.
Which of the following correctly compares UV rays and x-rays?
X-rays have the same wavelength as UV rays.
UV rays have the same energy as X-rays.
X-rays have a higher frequency.
UV rays have lower energy.
Answer:
answer is c
Explanation:
All the stars you can see at night are still in existence.
True
False
Answer:
FALSE
Explanation:
help me plssssss asap. thanks.
Which geological feature plays a role in determining the boundary of watersheds?
a)River systems
b) Ridge lines
c) Tributaries
d) Flood plains
help me with this plsssssssssssssssssssss
Answer:
A
Explanation:
Please give me Brainliest my friend
Which of the following describes the alleles possessed by the ‘unknown parent’?
Answer:
there are no choices
Explanation:
9. What is the best source of vitamin C in a balanced diet?
A fish
B fruit
C meat
D rice
Answer:
Fruit
Explanation:
genetics plz help me with this plzzz
Answer:
1. 100% O
2. 25% A, 25% B, 50% AB
3. 18.75% A, 18.75% B, 56.25% AB, 6.25% O
4. 50% A, 50% B
Explanation:
Im not too sure about 3, but the others should be correct.
What type of land feature is located at point D?
Answer:
Peak of a mountain
Explanation:
How long does ur nose hurt when u hit ur nose hardly on a glass wall?
This is on my worksheet...
Answer:
Depending on how you hit your nose on the glass wall it could be hurt for a while. This person probably broke his nose.
Explanation:
Hope this helps.
Have a great day!
In Sparta, from life to death, it was considered a "cruel life why?
According to Mark Kurlansky, how long could it take for most of the fish we commonly eat to be gone?
Answer: 50 years
Explanation: Good luck! :D
If a mosquito bites a human vein, will the mosquito explode?
Answer:
No
Explanation:
it wont explode because mosquito's bite our veins, that's how they get their food and how they make their lava. now if a mosquito bit our artery, then they will explode.
I'LL GIVE BRAINLIEST IF YOU EXPLAIN THE ANSWER AND IF IT IS RIGHT:
Answer: D
Explanation:
Many unicellular organisms live in bodies of water and must move around to find food. Most often, they must obtain nutrients by eating other organisms. Plant-like protists, and some types of bacteria, can make their own food through photosynthesis.
can someone help me?
Answer: i'm confused on what i'm supposed to do
Explanation: pls give me more of a question that is not confusing ok then i could help you out
Can someone help me? This is due tonight and I have 14 more assignments to do. I'm kinda confused on this
Write the formula for cellular respiration and photosynthesis. Compare and contrast both.
Write a paragraph summarizing the relationships that different organisms can have in an ecosystem and how they interact. Make sure to have at least 3 types of relationships, including examples from nature that show how these organisms interact.
Plz Help!! I need this done by 9 P.M. and it's 8:30 P.M.
Thx if you help Btw
Answer: So do you still need help?
Explanation:
i need help asap pls and thank you.
Answer:
i think it would be A (aka the first answer)
Explanation:
im sorry if im wrong
the shape of earths orbit is nearly circular...
true or false?
Answer:
The Earth's orbit is a nearly circular ellipse. The Earth's orbit is an extremely elongated ellipse. The Sun is located at the only focus point. The Sun is located at one of the two focal points.
How do you know you exist?
Answer:
through ur senses lol good question
Explanation:
Answer:
Umm if people see you and talk to you thats how you know your living in earth hope this helps?
Explanation:
Evaporation happens in the Dead Sea and other bodies of salt water (like the oceans) as part of the water cycle. What fuels evaporation in bodies of salt water?
Answer:
Heat (energy) is necessary for evaporation to occur. Energy is used to break the bonds that hold water molecules together, which is why water easily evaporates at the boiling point (212° F, 100° C) but evaporates much more slowly at the freezing point. Net evaporation occurs when the rate of evaporation exceeds the rate of condensation. A state of saturation exists when these two process rates are equal, at which point the relative humidity of the air is 100 percent. Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water. In fact, the process of evaporation removes heat from the environment, which is why water evaporating from your skin cools you.
Explanation:
Solar energy fuels evaporation in bodies of salt water. Evaporation happens in the Dead Sea and other bodies of salt water (like the oceans) as part of the water cycle.
What is evaporation?Evaporation in bodies of salt water is fueled by solar energy from the sun. The sun's heat causes the water molecules in the surface of the salt water to gain energy and become more active. As the water molecules become more active, they gain enough energy to break free from the liquid and become water vapor, which rises into the atmosphere. This process is known as evaporation.
In bodies of salt water, the process of evaporation leaves behind salt and other minerals, which increases the salinity of the water. The high salinity of the Dead Sea and other saltwater bodies can also affect the evaporation rate, as the presence of salt can make it more difficult for water molecules to escape from the surface.
Learn more about evaporation, here:
https://brainly.com/question/5019199
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use this branching diagram to answer the questions. IF U DONT KNOW THE ANSWER THEN DONT PUT AN ANSWER.
Look at the possible derived shared characteristics, shown in the text box. Think about where these should be placed along the branching tree diagram. From the text box, select a shared derived characteristic that frogs and pigeons have. Explain why you think frogs and pigeons share this characteristic.
1.
2.
3.
4.
5.
HOW ARE FROGS AND PIGEONS RELATED?:
Answer:
Explanation:
The common characters shared by frogs and pigeons are:
presence of jaws
four limbs
The frogs and pigeons share these characteristics because they both are derived or evolved from a common ancestor.
During the course of evolution, the jaws are evolved in beaks in birds or pigeon as beak is light-weight in comparison to jaws.
Similarly, the forelimbs get covered with feathers to become wings.
The common characters shared by frogs and pigeons are:
presence of jawsfour limbsThe frogs and pigeons share these characteristics because they both are derived or evolved from a common ancestor. During the course of evolution, the jaws are evolved in beaks in birds or pigeon as beak is light-weight in comparison to jaws.
What is the similarity between bat and pigeon?Similarity between bat and pigeon is that both from to same domain i.e Animalia.
Both are winged animals with stream lined body that allows them to fly.
Similarly, the forelimbs get covered with feathers to become wings.
To learn more about Animalia click here:
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The zero position along its equator points toward the center of our galaxy in the
celestial spheres
ecliptic planes
equatorial coordinate system
galactic coordinate system
Answer: galactic coordinate system
Explanation:
the last one (galactic coordinate system)