You find a rock sample with radioactive atoms present. 25% of the original radioactive atoms were present, how many half lives have passed

Answers

Answer 1

Answer:

Im literally taking a test that my teacher made and i have no idea what the answer is

Explanation:


Related Questions

I NEED THIS ASAP!!!!!
Gravity is an example of which kind of force??
A) contact
B) noncontact
C) speed
D) direction

Answers

Answer:

I want to say B. Noncontact

Explanation:

I hope this helps!

Answer:

b

Explanation:

Consider the diagram of the basic structure of a bacterium. A diagram of a bacterium is labeled. Part A is the cell membrane, part B is the flagellum, part C is the nucleoid, and part D is the pilus. Which of the labeled structures in the image allows bacteria to exchange genetic material and thus evolve to be better pathogens?

Answers

Answer:

Part D: pilus

Explanation:

Conjugative pili allow for the transfer of DNA between bacteria and thus evolve to be better pathogens.

The structure in bacteria that allows them to exchange genetic material and evolve is the pili

Bacteria pili

Pili (pilus, singular) are thin, proteinous structures located on the surface of bacteria that serves as:

they help bacterial cells to attach to surfacesthey serve as channels for the transfer of genetic materials during conjugation

When genetic materials are transferred through the pilus, gene recombination occurs and bacteria evolve as a result.

More on bacterial pili can be found here: https://brainly.com/question/6168872

what organization has classified countries as developing or developed?

Answers

The United Nations..

Is energy recycled?

Answers

Answer:

Energy is not recycled in ecosystems and each ecosystem requires a continuous input of energy to sustain it. There is some energy transformed at each level of the food chain or food web in an ecosystem. In an ecosystem, energy is frequently transformed from one form to another

QOD: have you downloaded Ecosia yet? why not? do it. n o w.

Answers

Answer:

What's Ecosia?

Explanation:

Which is a heterotrophic protist?

A.
euglena, because it has chloroplasts

B.
volvox, because it has an eyespot

C.
volvox, because it has cilia

D.
amoeba, because it engulfs food

Answers

D I’m not sure though
I’m pretty sure it’s D

CO2 + H2O + energy --> C6H1202 + O2 , what is this formula for ?

Answers

Answer:

Photosynthesis, the energy is sunlight

I need help on this ASAP!! Cellular respiration and photosynthesis

Answers

Answer:

1 and 3

Explanation:

Why are some genes expressed (turned on) and some genes not expressed (turned off) in a cell?

Answers

Answer:

some genes can funtion on their own

Explanation:

Select the correct image. Which cell is the most specialized?

Answers

Answer:

no pics

Explanation:

Answer:

Where is the image?

Explanation:

Though all humans start off the same way, give a brief explanation about what makes us all so different

Answers

Haha yep what they said

Consider the generalized cladogram of fish.

A cladogram is shown. At point B, the organism shares jaws but not bones.

A fossilized fish is found that has jaws but no true bones. Where does this fossil belong on the cladogram?
A
B
C
D

Answers

Answer:

A

Explanation:

Answer:

D

Explanation:

yes

Which two organs do not have glands at all? Name it.

Answers

Answer:

The esophagus and large intestine. If this is for humans

Explanation:

Which amino acid sequences can be coded from the DNA sequence CAG TAG CGA?

Answers

The answer would be: GUC AUC GCU

plz help. how did Darwin almost ruin the data he had for his Galapagos finches?​

Answers

Answer:

by nearly dropping the book in the ocean

How many offspring would have green seeds?​

Answers

25% if green is recessive due to both of the yy

Please help me I really need help I am having a hard time with this question.

Answers

Answer:

I would prefer to have city water because you don't have to worry about it getting polluted unlike well water. The city water is maintained by the city while with the well water, you maintain it yourself. Even though it can be pricey, most people live in the city anyway, so there is easier access to it.

Explanation:

Answer:

Well Water

Explanation:

I would prefer well water, because city water had a lot of chemicals, and city water filters out minerals that are good for the body. Also, well water tastes ten times fresher than city water. Also, well water is easy to obtain if you already have a well, all you have to do is wither pump it up, or use a basket to scoop some out.

Explain how DNA results in the expression of a gene using the following words: DNA, mRNA, tRNA, gene, transcription, and translation

Answers

Explanation:

in order for a gene to even be transcribed, it must be "turned on" or "expressed" meaning the nucleotides have moved away from each other. after it's expressed, the gene will unwrap and continue on with transcription, and make mRNA copy of a DNA strand. once RNA is made it will leave nucleus and enter cytoplasm to find a ribosome. once it attaches to ribosome, translation begins, and a tRNA will bind to anti-codon, and the building of a polypeptide/protein will begin.

What percentage of the total incoming radiation to the Earth reaches the ground?

A. 20
B. 30
C. 40
D. 70

Answers

Answer:

A. 20

Explanation:

Truth is its actually 22.5 but including that you can just round it, 20 is the best answer.

Answer:

20

Explanation:

Diversity among members of a species is important because diversity

a
increases the chances of survival under changing conditions.
b
ensures high levels of competition.
c
increases the available ecosystem resources.
d
ensures the variety of reproductive methods for a species.

Answers

Diversity among members of a species is important because diversity increases the chances of survival under changing conditions.

If a disease spreads throughout a species, the species with genetic diversity will survive. If the species does not have genetic diversity, they will be wiped out by the disease.

A because the more genetic diversity a species had, the more likely they are to have characteristics that are needed to survive. Plz vote brainliest

The process of natural selection requires all of the following, except:

Group of answer choices:

A.) genetic inheritance through reproduction

B.) environmental pressure

C.) advanced or complex species

D.) variation of a trait

Answers

Answer:

C.) Advanced or complex species

Write a short note on oxygen gas

Answers

Answer:

alr

Explanation:

Oxygen is a colourless, odourless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere

Hoped it helped^^

(。づ ’▽’。)づ♡#CarryOnLearning

Identify another use for gel electrophoresis other than in criminal investigations (forensics).

Answers

Answer:

it can be used in clinical chemistry to separate proteins based on size and charge

Explanation:

if im wrong im sorry im pretty sure they use this in clinical chem.

Connect the importance between meiosis and the process of sexual reproduction. Is it possible to survive without your reproductive system? Explain.

Answers

Answer:

This can be made possible through reproductive cells undergoing meiosis since such process has specialized sex cells split and multiple after copulation. To answer the question if is it possible for a human to survive without a reproductive system, the answer is yes.

Explanation:

Why is a feather non living? Give detailed explanation. Thanks

Answers

Answer:

feathers are dead tissues. They are only alive while developing as they have a blood supply. Feathers are produced by living cells located in small pit-like follicles in a bird's epidermis, its outer skin layer. The feather is enlarged by the keratin that is protruding straight out from the skin follicle. In order for something to be classified as anything that was never alive

Explanation:

feathers are non-living because theyre dead tissues. theyre produced by living cells in a bird epidermis and as it reaches full size, the blood supply is cut off and the feather is fully functional but non-living

Which process occurs during the growth and development of a fertilized human egg?
(1) cell division
(2) natural selection
(3) germination
(4) evolution

Answers

Answer:

cell division

Explanation:

Answer:

option A

Explanation:

option A is the correct answer.

as for the growth and development of the fertilized egg zygote which is a single cell it divides and form new cells and became embryo and foetus later on .

hope this will be helpful to you.

plz mark my answer as brainlist plzzzz.

When food is being mechanically digested, it is being
(1) changed into another substance
(2) made smaller in size
(3) converted into energy
(4) excreted from the body

Answers

Answer:

(2) made smaller in size

Explanation:

Mechanical digestion involves physically breaking the food into smaller pieces.

Answer:

2

Explanation:

2 because it makes sense and we chew food to make it smaller to digest it easily

PLEASSSSSE HELP ME
PLS :(

The following diagram shows the branching tree for four kingdoms and some of their shared derived characteristics.

What shared characteristic can be written at point X? Use complete sentences to explain your answer.

Answers

Answer:Multicellular and Eukaryotic are traits that can be true for every Kingdom past Protists on this branching tree diagram. These are the traits which were evolved that Protists just missed, plants and fungi got these traits and transferred them to their descent as well.

Explanation:

One day while hiking, Maria found a rock in the wall of a canyon. In the rock, she noticed an impression of a leaf. Which answer best describes what Maria has found?
ODNA
O fossil
O genetic evidence
O developmental pattern

Answers

Answer:

B. Fossil

Explanation:

According to National Geographic, "Fossils are the preserved remains, or traces of remains, of ancient organisms." When you find the impression of a leaf, the leaf imprint is the preserved remains of the leaf.

Answer:

Fossil

Explanation:

I've had this question on my test

How many atoms are in this picture?
Na3C6H507

Answers

Answer:

Explanation:

Trisodium citrate has the chemical formula of Na3C6H5O7. It is sometimes referred to simply as "sodium citrate", though sodium citrate can refer to any of the three sodium salts of citric acid. It possesses a saline, mildly tart flavor. It is mildly basic and can be used along with citric acid to make biologically compatible buffers

Sodium citrate is chiefly used as a food additive, usually for flavor or as a preservative. Its E number is E331. Sodium citrate is employed as a flavoring agent in certain varieties of club soda. It is common as an ingredient in bratwurst, and is also used in commercial ready-to-drink beverages and drink mixes, contributing a tart flavor. It is found in gelatin mix[clarification needed], ice cream, yogurt, jams, sweets, milk powder, processed cheeses, carbonated beverages, and wine[citation needed], amongst others.

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