An experiment was designed to test the effect of ultraviolet light on the growth of mold spores. A sample of mold spores was divided into two groups. The groups were grown under the same conditions, except that group A was exposed only to ultraviolet light and group B was grown in total darkness. What is the purpose of group B being grown in total darkness?

To limit bias

It is the dependent variable

It is the control group

To add an alternative variable

Answers

Answer 1

Answer:

C

Explanation:


Related Questions

Origin: lateral third of clavicle, acromion, and spine of scapula. Action: abduction, flexion and extension, medial and lateral rotation of arm * Deltoid Infraspinatus Supraspinatus Subscapularis

Answers

Answer:

The correct answer is - Deltoid

Explanation:

Deltoid muscles are thick triangular muscles that help in raising and rotating arm covers shoulder joints. It originates lateral third of the clavicle, inferiorly along the spine of the scapula to the acromion.

Deltoid muscles provide actions that include flexion and medial rotation, abduction, and extension, and lateral rotation at the shoulder joint. Deltoid means triangle or that has three sides as it has three originating sides.

The wing of a bird and the leg of a horse are very different looking structures. Although they look different, bird wings and horse legs are very similar in the arrangement of the bones that make up the limb. Which term is used by scientists to describe structures that look different on the outside but are actually similar in construction and develop from the same embryonic tissues? es -0) A) common descent B) analogous structures vestigial structures D) homologous structures Answer:

Answers

Answer: Homologous structures

Explanation: They are structures which have similarities in various organisms but carry out opposite functions. This is the opposite of analogous structures

Conservationists help to restore ecosystems. Which activity will positively affect the abiotic conditions of an ecosystem?

A.

Keeping lakes and rivers free of pollution.

B.

Planting new trees to provide food for animals.


C.

Monitoring the ecosystem for bacterial pathogens that can cause illness.


D.

Mating endangered animals in captivity and restoring them to their natural habitat.

Answers

The answer to your question is c

Which type of growth can occur only when a population has unlimited resources?
limited
logistic
exponential
negative

Answers

Answer:

c. on edge

Explanation:

When resources are unlimited, populations exhibit exponential growth, resulting in a J-shaped curve. The correct answer is c) exponential.

What is the exponential growth curve?

Exponential growth curves and logarithmic growth curves are the two different forms of growth curves. In an exponential growth curve, the slope increases steadily over time. A logarithmic growth curve has a steeply increasing slope that gradually flattens out over time.

The exponential growth curve, which has a J-shape, shows a period of time where the results develop rapidly and steadily. It is the reverse of gradual progress. This curve initially climbs gradually before accelerating, which represents multiplied growth.

With exponential growth, a population's growth rate per capita (per person) remains constant regardless of population size, causing the population to expand exponentially as it grows larger. In nature, populations may expand exponentially for a while, but ultimately, their growth will be constrained by the availability of resources.

Exponential expansion happens when resources are unrestricted. Due to the favorable conditions, there are a lot more births as a result of the food excess.

Therefore, the correct answer is c).

For more details regarding the exponential growth curve, visit:

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1. Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature? ​

Answers

»» (c) Biological names can be written in any language.

EXPLANATION:

➱ Biological names are derived either from Latin language or are latinised. This is because Latin language is a dead language and therefore it will not change in form or spellings with the passage of time.

Which gas was most likely not present in creating the amino acids of early Earth's waters of the past?
ammonia
sulfur
hydrogen
nitrogen

Answers

Answer: the answer is sulfur.

Explanation: I took the test

List 3 examples of something that have evolved over time.

Answers

Answer:

peppered moth- became darker because of pollution

darwins finches- beaks became smaller over time to eat the smaller nuts/seeds left

deer mice- became lighter being as their surroundings changed/ones that moved from forrests

Answer:

Peppered mothDarwin's finchesDeer mice

Explanation:

These are the 3 examples of something that have evolved over time.

why are plants the start of the food web

Answers

Thus the living part of a food chain always starts with plant life and ends with an animal. Plants are called producers because they are able to use light energy from the sun to produce food (sugar) from carbon dioxide and water. Animals cannot make their own food so they must eat plants and /or other animals.

13 POINTS MY DUDES! AND NO LINKS OBVIOUSLY!!!

In a moth population, 47 are brown, 15 are yellow, and 34 are black. What is the approximate probability of a moth being black?

A. 2%
B. 49%
C. 16%
D. 35%

Answers

Answer:

D

Explanation:

34/96= 35%

The mathematical rule of three can be used to take probabilities. In the exposed example, the approximate probability of a moth being black is 35% (Option D).

------------------------

Available data:

47 moths are brown15 moths are yellow34 moths are black

The total number of individuals in this population equals the addition of brown, yellow, and black individuals.

This total number of individuals equals 100% of the population.

So to get the probability of a moth being black, we can just perform a rule of three.

To do it, we need to get the percentage of black individuals in the current population.

96 moths ------------------------- 100% population

34 black moths ----------------- X= (34 x 100) / 96

                                                 =35.41 ≅ 35% of the population

The approximate probability of a moth being black is 35%.

----------------------------------

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You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives regular water. After a two-week period, the height is measured.

Answers

you water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured. i think the indepent variable is sunflower ... variable is height measured and the control variable is the fourth plant.

Which of the following cells should have the most mitochondria?
O skin cells
O muscle cells
O blood cells
O nerve cells

Answers

Muscle cells have the most mitochondria

What is the purpose of an outline?
to list the main topics and show the order they will appear in
to show the number of sentences in each paragraph
to help you remember key words about your topic

Answers

Answer: to list the main topics and show the order they will appear in

Explanation: Outlines are intended to help a person organize a paper and help the paper flow well.

Answer:

to list the main topics and show the order they will appear in

Explanation:

Kelp forests are unique and diverse coastal ecosystems in the ocean. How would a
decrease in biodiversity in these ecosystems, due to changing climate, affect the larger biosphere? please help!!!

Answers

Explanation:

Kelp forests are the anchor of nearshore ocean wildlife communities across the U.S. West Coast and northeast, sustaining marine biodiversity by providing shelter, habitat and even food for an array of fish and invertebrates.

the life is very beautiful thing to gift by God. a some are happy. b. some are sad c. some are smile. choose any one​

Answers

Answer:

i pick C

Explanation:

Because in any situation both good or bad we should smile

Well A and C works hand in hand though

An important difference between a series and a parallel circuit is that a series circuit cannot have any breaks. A parallel circuit can have a break in one branch and the current can still flow through another branch.

Answers

Answer:

Yes.

Explanation:

Parallel circuit are those types of circuits in which break in one branch does not prevent the flow of current in the circuit and the current can still flow through another branch because there are more ways through which the current moves to other sources while on the other hand, series circuit refers to those circuits in which break in one branch can prevent the current flow in the circuit and the other sources can't receive current due to broken of the connection.

What kind of relationship do these
bacteria and humans have?
a. Commensalism
b. Mutualism
c. Parasitism
d. Predation

Answers

Answer:

a.commenslism

Explanation:

hope it helps

Bison have come close to extinction due
to uncontrolled hunting, drought, and
disease. There is now very
little
genetic variation in bison
populations.
Which of the following is a result of the
limited genetic variation in the
current bison populations compared
to earlier bison populations with
more variation?
Select one:
O a. Bison in current populations are more resistant to new
diseases.
O b. The survival rate of young bison has increased in current
populations
O c. Bison in current populations are less able to interbreed with
other species
O d. The current bison populations are less likely to be able to
adapt to environmental changes.

Answers

Answer:

D.

Explanation:

Genetic variation among species is a result of adaptation to new environments, and the lack of genetic varition among bison species means that they are less likely to adapt to different environmnetal changes. this might be due to bison staying in a particular areas to not be hunted or ridden by disease.

In this part of the laboratory exercise, you will learn how to read a weather station model. Using your Earth Science Reference Tables, fill in the data tables below each station model.​

Answers

Answer:

welp, hope he helps you sir!

Explanation:

Which statement correctly describes the difference between cellular respiration and photosynthesis?
A.
Photosynthesis involves chemiosmosis, and cellular respiration doesn’t involve chemiosmosis.
B.
Photosynthesis doesn’t produce any ATP, and cellular respiration produces ATP.
C.
Photosynthesis occurs during the day, and cellular respiration occurs at night.
D.
Photosynthesis creates energy that the plant stores, and cellular respiration utilizes the energy.
E.
Photosynthesis is an anabolic reaction, and cellular respiration is a catabolic reaction.

Answers

Answer:

The answer is E.

Explanation:

An anabolic reaction is one that involves the building of complex substances from simple ones and it uses up energy. Photosynthesis is an anabolic reaction because It requires energy.

A catabolic reaction is one that involves the breakdown of complex substances into simpler ones and in the process energy is released. Cellular respiration is catabolic because energy is released during this process.

Answer:

The person is correct

Explanation:

I got it right

What is the diaphragm? Please help!

A. muscle
B. tendon
C. cartilage
D. ligament

Answers

Answer:

A

Explanation:

because

Answer:

A.muscle

Explanation:

It's the muscle below our lungs

help me !! …………… …….

Answers

The first answer is volcanoes
The second answer is They move because of convection currents in the mantle

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Cross an individual who is heterozygous for baldness with one who is hom0zygous recessive. If the children were all boys, what would the phenotypic ratio for the above cross be? What would the phenotypic ratio be if they were all girls?

Answers

my answer would be 2:2 for the first one and if they were all girls, assuming none are bald, the ratio would be 4:0. sorry if i’m wrong that’s just how i solved the problem:)

1. Which weather station model above would most likely have snow? ___________
2. Which weather station model above would most likely have rain? ____________
3. Which weather station above has the highest air pressure? ____________
4. Which weather station model above has the highest wind speed?_________

Answers

Answer:

1. Station B

Station B has one of the lowest temperatures of 32°F(top left) which is a temperature that snow can form at. It also has full cloud cover which is something that station C does not have and as clouds are needed for snow, station B is most likely to have snow.

2. Station A

Station A has the highest dew point at 75 (bottom left) which means that it has the highest humidity and so is the most likely to have rain. That along with a full cloud cover (shaded circle), means there are clouds for rain to fall from.

3. Station B

Has the highest pressure at 998.

4. Station C

Wind speed is measured by the lines protruding from the circle and for this simplistic model, the more lines it has, the faster the wind is going. Station C therefore has the fastest wind speed.

How can black hole be destroyed?

Answers

Answer:

Eventually, in theory, black holes will evaporate through Hawking radiation. But it would take much longer than the entire age of the universe for most black holes we know about to significantly evaporate.

Explanation:

help please will mark brainlist answer

Answers

Answer:

Question 2 is option 2. It is the only one that makes sense and it says sediment sin it.

Explanation:

option 2 because a sedimentary rock is a rock with multiple layers of different rocks together

An organism's appearance, trait or other detectable characteristic is a what?

Answers

[tex]\huge{ \mathfrak{ \underline{question : }}}[/tex]

An organism's appearance, trait or other detectable characteristic is a what?

[tex]\huge{ \mathfrak{ \underline{ Answer \: \: ✓ }}}[/tex]

The Organism's Phenotype is it's appearance or visible trait.

[tex]\#TeeNForeveR [/tex]

Genes are strands of
found on chromosomes in the nucleus of a living cell.
A
mutations
B
DNA
C
minerals
D
cells

Answers

Answer:

b)DNA is the correct answer

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I think I’m not sure but I think it’s B

Select four ways bacteria growth is controlled.

food irradiation
boiling
freezing
refrigeration
canning
harvesting methods
fertilizer

Answers

Answer:

boiling, freezing, refridgeration, and fertilizer.

Explanation:

the first three have to do with temperature, which tends to kill bacteria. Pesticides kill bacteria by poisoning them

Every organism requires a set of instructions that specifies its traits. This information is carried with the cells of the organism. Which set of statements BEST describes hereditary information in eukaryotic cells? Group of answer choices

Answers

Answer:

This question lacks options, the options are;

A. Genes are made up of chromosomes and both are found in the cell’s cytoplasm.

B. Chromosomes are made up of genes and both are found in the cell’s cytoplasm.

C. Genes are made up of chromosomes and both are found in the cell’s nucleus.

D. Chromosomes are made up of genes and both are found in the cell’s nucleus.

The correct answer is D.

Explanation:

As rightly stated in this question, every living organism requires a set of instructions that specifies its traits. These set of instructions are embedded in a unit called GENE. Genes hold information needed for the survival of a cell in an organism.

These genes are located on a structure called DNA, which are folded or packaged into another structure called CHROMOSOMES. Each chromosome, hence, contains genes that are the unit of inheritance of a cell. In eukaryotic organisms, the gene is found on a chromosome, which is located in the NUCLEUS of the cell.

Replication is said to be semi-conservative. What does this mean about the chain being made?

Half is_______________________________, the other half is_________ __________

Answers

Answer:

Explanation: Replication is a semiconsecutive process this means that the strands of the DNA molecule separate to form two separate templates which will then combine with nucleotides following the complementarity base sequence to form two new daughter DNA

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