Water fleas (Cladocera) are small freshwater crustaceans. They are filter feeders can are about 3-5mm long. The outer carapace of a water flea is transparent so the internal organs can be observed. Caffeine raises the heart rate of humans. Hanna predicts caffeine will have the same effect on other organisms. She uses the water flea as her test subject in an experiment. Hanna introduces varying amounts of caffeine to water flea populations. Using a microscope, she measures the heart rate in beats per second of sample water fleas. She records the data in a table. As the concentration of caffeine increases, Hanna observes the water flea heart rate also increases. What is the hypothesis in Hanna’s experiment? A) Caffeine raises the heart rate of humans. B) Water fleas prefer caffeine over plain water. C) Caffeine increase the heart rate of the water flea. Eliminate D) The effects of caffeine are the same on all organisms.

Answers

Answer 1

Answer:

The Answer is C.

Explanation:

sorry i took awhile

Answer 2

The hypothesis is the part of the scientific method that is the supposition based on some observed data. In Hanna's experiment, "caffeine increase the heart rate of the water flea" is the hypothesis. Thus, option C is correct.

What is a hypothesis?

The hypothesis has been defined as the conjecture that is proposed in a scientific method and is based on the speculations from the observed facts and information. It is proposed to perform the experiment and reach the conclusion of the reliability.

They are testable and are performed through the experimental design that includes the experimental and control group so that the collected evidence can be analyzed and proved to be true. In Hanna's experiment, the effect of caffeine on the heart rate of fleas is a hypothesis.

It is a hypothesis as it is based on the observed fact that caffeine increases the human heart rate. The caffeine acted as the independent variable and the heartbeat was the dependent variable that showed that water fleas have increased heartbeat if given caffeine.

Therefore, option C. caffeine increases heartbeat is the hypothesis.

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Related Questions

For something to be considered living, it must be composed of at least one what?

Answers

Answer:

[tex]\boxed {\tt Cell}[/tex]

Explanation:

There are many characteristics of life, including, cells. A cell is a tiny unit of life that carries out many different processes.

If something is considered living, it must have at least one cell, but it can have more. For example, bacteria is unicellular and living. We (humans) are also living, but made of billions of cells.

Therefore, for something to be considered living, it must be composed of at least one cell.

5. If the lever arm is longer than the load arm, this lever system would be
a class three lever system
b. a high speed system
c. a power system
d. disfunctional and is never seen in biological systems.

Answers

Answer:

B

Explanation:

nose pienso q es eza

The Murray River can be found in: South, America ,Europe, Africa ,Australia or Asia? :>

Answers

Hey there!

ANSWER:

South Australia

EXPLANATION:

Where can the Murray river be found?

The Murray River is located in South Australia. Since that's where it's located, you can find it there.

Hope this helps!

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What is the role of the biomolecule represented in this diagram?

Answers

Answer:

provides energy and insulation

Explanation:

the biomolecule is carbohydrates or lipids

During which phase does the cell actually separate into two individual daughter cells?

Answers

Answer:

During which phase does the cell actually separate into two individual daughter cells? Explanation: Cytokinesis is the phase during which the cytoplasm of the cell divides and the cell actually separates into two cells. The term cytokinesis actually means cutting (kinesis) of the cytoplasm.

Explanation:

The parent cell separates into two individual daughter cells in the cytokinesis phase of mitosis. Details about cytokinesis can be found below.

cell.

What is cytokinesis?

Cytokinesis is the process in which the cytoplasm of a cell divides following the division of the nucleus.

Mitosis is the biological process by which living cells replicate themselves and create offsprings.

Mitosis primarily involves the division of the nucleus while Cytokinesis is the division of parent cells into daughter cells.

Therefore, the parent cell separates into two individual daughter cells in the cytokinesis phase of mitosis.

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which statement describes how diffusion works? answer for edgenunity ​

Answers

Answer:

Diffusion is the movment of particles from an area of high concentration to a low concentration down a concentration gradient

the answer is c on e

2.
4.00
POOZE 1
nucleus outside smallest inside
electrons neutral element neutrons
largest
atom
Atoms are the smallest unit of an
Within the atom is a
which is the center of the atom. The
and
neutrons are located within the
The
are outside the nucleus. The neutron has a
charge. A helium atom is the
unit of an
element. The element helium has a mass of
A helium atom has
protons and
neutrons. The electrons are
located on the
of the

Answers

Answer:

1) element

2) nucleus

3) protons

4) nucleus

5) electrons

6) neutral

7) smallest

8) 4.00

9) 2

10) 2

11) outside

12) nucleus

Explanation:

i got help from my brother and mom btw lol.....

Which of the following is not one of the top five greenhouse gases? A. Methane B. Water vapor C. Carbon monoxide D. Ozone

Answers

Answer:

carbon monoxide

I did the test and notes and got it right!!!!

Explanation:

d4 Science)
7. Where do you find membrane-bound organelles?

Answers

Eukaryotic cells contain many membrane-bound organelles. An organelle is an organized and specialized structure within a living cell. The organelles include the nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, vacuoles, lysosomes, mitochondria, and, in plants, chloroplasts

One parent has curly hair the other has straight hair in their child has wavy hair this is an example of

Answers

Answer:

incomplete dominance

1. How many cells would you expect to find in a multicellular organism?

Answers

Answer:Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions. In humans, cells differentiate early in development to become nerve cells, skin cells, muscle cells, blood cells, and other types of cells

Explanation:

Answer:

Hmm.

Explanation:

Organisms made up of more than one cell are categorized as multicellular organisms.

Which of the following is not a surface of the lungs?
a. Mediastinal surface
b. Cardiac surface
c. Costal surface

Answers

C. Costal surface.

Please please pleaseeee tell me if this is wrong.

it should be b sorry if i’m wrong .

Help due tomorrow!!!

Answers

Lemon juice is 10,000 more acidic than urine

For which of the following purposes would the energy pyramid shown be LEAST useful? (1 Point)
PLEASE IF YOU KNOW TELL ME

Answers

Answer:

A: developing a weed killer for eel grass

Explanation:

Chapter 1 biology the science of life

Answers

Answer: Unsure

Explanation:

Just doing this for the points

Answer:

grade 9 biology 2021 all chapter

why do all organisms share the same genetic code?

Answers

Answer:

DNA is considered a universal genetic code because every known living organism has genes made of DNA. ... All organisms also use DNA to transcribe RNA, and then they translate that RNA into proteins. Every living organism uses that same system. Basically, every three pieces of DNA becomes one amino acid.

Explanation:

because it is

State any eight point about China Rose.​

Answers

Eight point about China Rose.

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Describe in brief the various types of teeth in humans. Add a note on dental formula of man.

Answers

PLEASE GIVE BRAINLIST

PLEASE GIVE BRAINLIST

PLEASE GIVE BRAINLIST

PLEASE GIVE BRAINLIST

PLEASE GIVE BRAINLIST

8 incisors. 4 canines, also called cuspids. 8 premolars, also called bicuspids. 12 molars, including 4 wisdom teeth.

Human: deciduous teeth: 212/212; adult = 2123/2123. Both childhood molars are replaced by adult premolars. Adult total is double the formula = 32. Opossum: 5134/4134 (one less incisor on each side of the lower jaw).

HOPE THIS HELPED

[tex]\huge\bold\red{Answer:-}[/tex]

The dental formula represents the arrangement of teeth in each half of the upper and the lower jaw. The entire formula is multiplied by two to represent the total number of teeth.

The dental formula for milk teeth in humans is:

[tex] \frac{2102}{2102} = 2[/tex]

Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, and 2 molars. Premolars are absent in milk teeth hence the zero.

The dental formula for permanent teeth in humans is:

[tex] \frac{2123}{2123} = 32[/tex]

Each half of the upper jaw and the lower jaw has 2 incisors, 1 canine, 2 premolars, and 3 molars. An adult human has 32 permanent teeth.

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘꜱ.❤

Where would you expect to find genetic material in a prokaryotic cell?

( WILL MARK BRAINLIEST)


A. In the organelles

B. In the cytoplasm

C. A prokaryotic cell does not genetic material

Answers

Answer:

Your answer is Option B

hope this helped you

please mark as the brainliest (ㆁωㆁ)

Answer:

B, in the cytoplasm

Explanation:

Most prokaryotes carry a small amount of genetic material in the form of a single molecule, or chromosome, of circular DNA. The DNA in prokaryotes is contained in a central area of the cell called the nucleoid, which is not surrounded by a nuclear membrane. This question is worded quite strangely, as the nucleus is an organelle it would make better sense to say in the organelles but it refers to organelles as plural and it's not in any other organelle but the nucleus, the cytoplasm is what surrounds the organelles and has direct contact with the cell membrane, the nucleoid also does not contain any enclosing membrane



realized
Linnaeus's ?

Answers

Answer:I dont not understand this question sorry

Explanation:

Answer and Explanation:

All modern classification systems have their roots in the Linnaean classification system. The Linnaean system is based on similarities in obvious physical traits. From the kingdom to the species. Each species is given a unique two-word Latin name.

If this isn't what you were asking then, sorry. I didn't understand the question but I sorta recongnized the word, "Linnaeus" so I thought this was what you were talking about.

Which ecosystem would be most sustainable if all the grasses died from severe drought

Answers

Answer:

Deserts

Explanation: Deserts need little to no water

organs in different animal locomotion​

Answers

Answer:

cilia, legs, wings, arms, fins, or tails are sometimes referred to as locomotory organs or locomotory structures.

hope this helped you

please mark as the brainliest (ㆁωㆁ)

What do bones contain?

Answers

Answer:

Made mostly of collagen, bone is living, growing tissue. Collagen is a protein that provides a soft framework, and calcium phosphate is a mineral that adds strength and hardens the framework. This combination of collagen and calcium makes bone strong and flexible enough to withstand stress.

Explanation:

hope that helps

Answer:

Bones contain a soft tissue called marrow.

Explanation:

edge 2021

Proteins....
A have a primary structure made from a string of anticodons.
B. have a primary structure made from a string of codons.
C. have a primary structure made of a string of amino acids.
D. have a primary structure made from a string of genes.

Answers

Answer is D: Have a primary structure made from a string of genes

Based on the discovery of Ötzi the Iceman in 1991, which statement about the nature of scientific knowledge is true?


a. It is permanent.

b. It is changeable.

c. New evidence is often disregarded.

d. New evidence always confirms the previous evidence.

Answers

The correct answer is D

Answer:

B. It is changeable

Explanation:

Otzi changed our thoughts about early humans

Which statement is false about B-lactam antibiotics?
a) They are inactivated by bacterial B-lactamases
b) They can maintain their activity by co-administering B-lactamase inhibitors
c) They are reversible inhibitors
d) They inhibit a bacterial transpeptidase reaction

Answers

Answer: c) They are reversible inhibitors

Explanation: B-lactam antibiotics are not are reversible inhibitors. reversible inhibitors are inhibitors which the allow enzymes they inhibit to start working again, as there is no perman effects on the enzymes ( there is no change to the shape of it active site.). They can sometimes appear as competitive, non-competitive or uncompetitive.

what is inherited traits that increase an organisms chance of survival, also determine an organism’s niche.

Answers

Answer:

inherited traits that increase an organisms chance of survival , also determine an organisms niche

Explanation:

An adaptation is a variation , or genetic modification , that supports an organism , such as a plants or animals , endure in its environment

is the current way of our living sustainable

Answers

I think so because most people have a decent life although they may complain about some things in it.

Interior layer of the Sun where hot and cooler gases circulate. A:convective zone B:chromosphere C:radiative zone D:corona

Answers

C is the answer

The answer is c

Which genotype is written incorrectly? AaAP pApr iiYy

Answers

pApr. You can’t have the dominant allele be the second(pA) allele
Other Questions
The first requisite of a good citizen in our republic is that he should be able and willing to pull his weightdoes this mean to a U.S. citizen? The British government rejected the Albany Plan of Union because it believed thatA)the plan might hurt the economies of the colonies.B)the central government should be located somewhere besides Albany.C)the colonies were capable of protecting themselves.D)the plan was unnecessary and might lead to colonial independence. Which set of stage directions reveals Mattie's anxiety?A.(Replaces receiver)B.(Smiling, in unison)C.(Standing, pacing, trying to control her annoyance)D.(They ad lib birthday greetings, sing "Happy Birthday", etc.) What allows negative feedback to control a system? A. The system slows down when input is reduced. B. The system speeds up when output is increased. C. The system has parts that sense the amount of input O D. The system has parts that sense the amount of output. A moving object is in equilibrium. Which best describes the motion of the object if no forces change?O It will change directions.O It will slow down and stop.O It will maintain its state of motion.O It will speed up and then slow down. Seven oxide thickness measurements of wafers are studied to assess quality in a semiconductor manufacturing process. The data (in angstroms) are: 1264, 1288, 1272, 1304, 1280, 1301, and 1270. Calculate (a) the sample average and (b) sample standard deviation. Round both answers to 1 decimal places. 2. Which of the following best describes John Locke's feelings about religion?*He thought there should be one national religion that everyone followsHe believed that people should be free to practice any religion they want. 2He believed that religion should not be practiced at all.He thought that people should be able to practice any religion, as long as thegovernment approved it. Dwayne is preparing a presentation for a group of art history scholars that are visiting his gallery. Which type of language should he use? formal, with basic terms and descriptions informal, with complex and dense descriptions informal, with easy-to-understand descriptions formal, with specialized terms and descriptions 2. My father wrote this book. It ..... by my father. *1 pointA. Will be wroteB. Was writtenC. Was writeD. Is written What do bones contain? What do the allusions to Google and Albert Einstein say about what might be included in a student's writing about the ability to store and remember information?(1 point) A) Google can provide answers digitally, while Albert Einstein was limited in his ability to store unlimited quantities of information. B) There is no relationship to the allusions of Google and Albert Einstein. C) Google is a search engine that can give information about virtually any topic, and Albert Einstein was considered a genius of his time. D) Albert Einstein influenced the modern version of Google. ASAP please What is an algorithm?1. a way to make an informed judgment2. used only on a computer3. used only with map directions4. a set of directions for problem solving Which two consecutive integers does v30 lie between?A)5 and 6B)6 and 7C)5 and 6D)6 and 7 if 49+ b2= 169, what is b2? -2+n=-8(1-8n)+6 solve for n. 2. Construct the perpendicular bisector of CD. Label the intersection of CD and the perpendicularbisector point M. (5 points)From c to d lineI need help fast NEED HELP ASAP YOU WILL GET 40 POINTS!!! Determine whether the boldface word is an adverb or an adjective. The artist's sketches are very imaginative. adverb adjective - 60= - 24 + 12rHow do I solve this problem and what are the steps to solve the problem 1. 4 more than the difference of 8 and a number to classify numbers first do have to simplify fractions or roots