Sarah performs an experiment to determine the effect of nitrogen on plants. She studies the effect of nitrogen on the growth of the root hair, height of the plants, and nodule formation. Which factor is an independent variable?

Answers

Answer 1

Answer:

Amount of Nitrogen

Explanation:

it's explained in :

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Related Questions

List three facts about glucose.

Answers

Answer:

Glucose is a sugar used for our body’s energy source

glucose is used for energy, fructose and glucose have the same formula but different struct-er, its a simple sugar

Explanation:

Was it beneficial or harmful for the Chthamalus barnacle to add the Balanus barnacle? Explain.

Answers

Answer:

It was it harmful for the Chthamalus barnacle to add the Balanus barnacle.

Explanation:

The principle of competitive exclusion says that two different species that share the same niche can not live in the same place. If these species have the same requirements, they can not coexist. Two species can not coexist indefinitely on the bases of the same limited resource.  

When two competing species coexist, this is because of niche partitioning or niche differentiation. If there is not any differentiation between them, the dominant species displaces the weak species.  

In the exposed example, Chthalamus can live in the upper intertidal zone, where Balanus can not live because they can not tolerate desiccation. Balanus live in the lower intertidal zone, where Chthalamus can not live because of its vulnerability to predation. But these two species compete for the middle intertidal zone, where they can both live. Balanus excludes Chthalamus because the first species is much bigger and grows faster than the second one. So the middle intertidal zone is only inhabited by Balanus.  

The area occupied by Chthalamus is smaller in the presence of Balanus. In the absence of Balanus, Chthalamus can live in a bigger area, occupying the middle intertidal zone.  

   

why/how is biodiversity essential to the health of an ecosystem

Answers

Answer:

Biodiversity is the amount of variety of life on Earth.

Explanation:

Biodiversity boosts ecosystem productivity where each species, no matter how small, it has an important role to play.

For example,

a larger number of plant species means a greater variety of crops. Greater species diversity ensures natural sustainability for all forms of life.

Because it provides a wide variety of ecological services essential to both ecosystem function and human well-being, biodiversity is important to the health of an ecosystem.

What is Biodiversity?

The term "biodiversity" describes the range of living things in an ecosystem, such as plants, animals, fungi, and microorganisms, as well as the genetic diversity found within each species.

Here are some justifications for why ecosystem health depends on biodiversity:

1. Nutrient Cycle: The ability of an ecosystem to cycle nutrients depends on biodiversity.

2. Temperature control: By absorbing carbon dioxide and generating oxygen through photosynthesis, biodiversity helps regulate temperature.

3. Soil health: Biodiversity is essential for the preservation of healthy soil.

4. Controlling pests and diseases in ecosystems: Biodiversity can help in managing pests and diseases.

5. Benefits to the Economy: Humans benefit economically from biodiversity in a number of ways, including access to food, medicine, and other natural resources.

Therefore, biodiversity is important for the health of ecosystems, and its loss can have serious detrimental effects on both ecosystem functioning and human well-being.

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Which event in Earth's history most directly allowed life to exist on land?

Answers

Answer:

Earth's temperatures increased, causing widespread evaporation. Earth collided with a large object, forming the moon. Single-celled organisms released oxygen into the air when they photosynthesized.

Answer:

Earth's temperatures increased, causing widespread evaporation. Earth collided with a large object, forming the moon. Single-celled organisms released oxygen into the air when they photosynthesized

Explanation:

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle. What is the common name of the group to which this organism belongs? bryozoans rotifers cnidarians mollusks there is a picture in the file below.

Answers

Answer:

cnidarians

Explanation:

bryozoan - "Bryozoa are a phylum of aquatic invertebrate animals. Typically about 0.5 millimetres long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a "crown" of tentacles lined with cilia." -Wikipedia

rotifers - "The rotifers, commonly called wheel animals or wheel animalcules, make up a phylum of microscopic and near-microscopic pseudocoelomate animals." -Wikipedia

cnidarians - "Cnidaria is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments: they are predominantly marine. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick.

" -Wikipedia

mollusks - "Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda. The members are known as molluscs or mollusks. Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high." -Wikipedia

(The Wikipedia entries are for describing.)

If you look at the pictures of all the answers, cnidarians look the most like the organism in the picture shown.

Answer:

Cnidarians

Explanation:

I took the test and got %100.

**WILL GIVE BRAINLIEST** DNA is a double helix with many regions. Which evidence best explains the structure of DNA? (4 points) A. The sequence of genes on a DNA molecule contain the instructions that code for proteins. B. DNA is a region on a protein that codes for genes that carry out cellular functions. C. The sequence of DNA on a gene contains the instructions that code for proteins. D. Genes contain regions that are called DNA and carry out functions essential to the cell.

Answers

The answer is A. Gene are sections of DNA that code for specific proteins.

The sequence of genes on a DNA molecule contains the instructions that code for proteins.

What is DNA sequencing?

DNA sequencing refers to the overall laboratory technique for figuring out the precise sequence of nucleotides, or bases, in a DNA molecule. The series of the bases (regularly mentioned by means of the primary letters of their chemical names: A, T, C, and G) encodes the organic statistics that cells use to expand and operate.

What are the steps in DNA sequencing?

Sample preparation (DNA extraction)PCR amplification of target sequence.Amplicons purification.Sequencing pre-prep.DNA Sequencing.Data analysis.

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Why is water pollution a concern if water is continuously cycled through Earth’s systems?

Answers

First of all, it makes algae grow, because pesticides and stuff provide too many nutrients. Algae needs a lot of oxygen and so the fish begin to die off because the algae is taking all the oxygen out of the lake. Next, it causes biodiversity to drop, meaning that species are beginning to get less varied. Water pollution harms the lakes and is a concern because the effects of it on species and the water will stay.

Water pollution is still a concern, even though its cycled through the Earth's system continuously, for many reasons. Firstly, people still continue to dump toxic chemicals, and plastic/ garbage into the water. Plastic doesn't decompose, it continues to sit and pollute the ocean unless it is cleaned up. Then there are also the chemicals. Some of these chemicals don't dissipate, or clear out for many years. There is also oil that has been spilt into the ocean. Even though it was many years ago, it still lingers in the ocean, and is very difficult to clean up. Secondly, there are bacteria and algae that lives in the water, which makes it very harmful for us if not cleaned out. The Earth's system is unable to keep these organisms out of the water. Thirdly, there is constantly water, even though water goes through the cycle, there is still unfiltered polluted water that stays, and then pollutes the filtered water. 

felt like this needed a better answer, so here you are. I got 100% on edgenuity 2020 with this.



According to the cell theory, which describes cells?​

Answers

Answer:

Living organisms are not created spontaneously

Explanation:

brainliest would be appreciated!

All living organisms are made up of cells and new called are created by old ones

In which two ways will a dog contribute to the carbon cycle

Answers

Dogs tend to eat meat, after all, and meat production is a major contributor of greenhouse gas emissions. By one estimate, it's even the largest. And dogs tend to eat highly processed meat, so their carbon pawprint grows as their food is manufactured, and again as it is transported.

Vhat role does cellular respiration play in the carbon cycle?

Answers

Answer: it releases CO2 into the atmosphere

Explanation:

Cellular respiration is the process by which organic sugars are broken down to produce energy.

Pls help me with this science question!!!!!!!!!!!!


THXS!!!!!!! Will be marked brainliest!

Answers

Answer: Glaze storm

Explanation:

A storm is a disturbed weather condition which is developed due to unstable wind currents. The center of wind currents are in low pressure whereas the surrounding are at high pressure. This condition forms clouds called cumulonimbus.

A glaze storm can be defined as a precipitation event in which the ice coating is formed on the exposed objects by the freezing of supercooled water deposited by the rain or fog on the surface.

Which strategy do geologists use to locate the center of an earthquake? A. They only analyze local data. B. They collect data from seismographs. C. They measure arrival times of surface waves. D. They draw squares on maps for measurements.

Answers

Answer:

the answer is (B) "They collect data from seismographs."

Explanation:

i got a 100 on the Quiz "Earthquakes"

The strategy that geologists use to locate the center of an earthquake is they collect data from seismographs. Thus, the correct option is B.

What is an Earthquake?

An earthquake may be defined as an activity that involves the unanticipated and brutal shaking of the ground, generally causing huge destruction, as an outcome of movements within the earth's crust or volcanic action.

Geologists utilize an instrument that is known as a seismograph that measures the strength of an earthquake. With the help of this instrument, they find the center of an earthquake on the basis of the highest strength.

Therefore, the strategy that geologists use to locate the center of an earthquake is they collect data from seismographs. Thus, the correct option is B.

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Where do eggs from fern grow?

Answers

Butt hole akaiskinsisnssnsisnsis

What is the correct formula for calculating the age of a meteorite if using half-life?

Answers

Your answer is Age of Object = n times t 1/2

Answer:  C

Explanation:  I took the test on Edge2020

A tropical rainforest includes trees, animals, insects, plants, rain, rivers, rocks, soil, and warm, moist air. Which spheres of Earth are represented in a tropical rainforest? A. biosphere, geosphere, hydrosphere B. cryosphere, hydrosphere, ionosphere C. geosphere, biosphere, cryosphere D. ionosphere, hydrosphere, geosphere

Answers

Answer:

The answer is A. Biosphere, Geosphere And Hydrosphere

Explanation:

The reason i choose this as the answer is it says "Tropical rain forest" it would only make since because hydrosphere is the "rain" in rain forest  and geosphere would be the life around the rain forest. Biosphere would be the life in the rain forest

The spheres of Earth that are represented in a tropical rainforest are ( A ) ; Biosphere, geosphere , hydrosphere

The tropical rainforest been comprised of trees, animals insects, rivers and rocks, soil and warm moist air. contains ;

Biosphere : The ecosystem comprising of living things ( animals ) and non-living factors that the living things derive energy from Geosphere :This covers the presence of rocks and other underground minerals in an ecosystem as seen in the tropical rainforest. Hydrosphere : since there are rivers and rains the hydrosphere is properly represented in the tropical rainforest as well.

Hence we can conclude that the spheres of Earth that are represented in a tropical rainforest are Biosphere, geosphere , hydrosphere.

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The question at the bottom

Answers

ANSWER:
RIGHT ANSWER IS C) OSMOSIS-DIFFUSION.
HOPE IT HELPS!!!!
PLEASE MARK BRAINLIEST!!!!!

In an experiment there are two groups. which group is not changed in any way

Answers

Answer:

The Control Group

Explanation:

Calculate if 1000 units of energy are available at the producer level of the energy pyramid about how many units are available for first level consumers? Second level consumers? Third level of consumers?

Answers

Answer:

first level consumers?- abou 100 units

Second level consumers- about 10 units

Third level of consumers- about 1 unit

Explanation:

Food chain describes the feeding pattern of a group of organisms in an ecosystem. The food chain shows how one organism in one TROPHIC LEVEL feeds on another organism in another. As organisms are being fed on, energy is being transferred.

A food chain always starts with a PRODUCER, which occupies the first and lowest trophic level. It creates the energy transfer as it obtains energy via photosynthetic process. The flow of energy as shown by an energy pyramid is Producer----First level consumer----Second level consumer------Third level consumer.

However, only about 10% of the available energy is transferred and accessible by the next organism. This is because about 90% of the energy has been lost as heat when the organism undergoes metabolic processes. Hence, if 1000 units of energy was present at the producer level, 10/100 × 1000= 100 units will be available to first level consumers.

Also, 10/100 × 100= 10 units of energy will be available to second level consumers and finally 10/100 × 10= 1 unit of energy will be available to talk third level consumer.

Question 8 of 30
1 Point
Which of the following elements is a key ingredient in both proteins and
nucleic acids?
A. Nitrogen
B. Sulfur
C. Phosphorus
D. Helium
SUBNE

Answers

Answer is A . Nitrogen i think because it express of genetic information

Answer:

nitrogen

Explanation:

Which of the following go through the process of photosynthesis?

Answers

Answer:

It's green plants and certain other organisms that transform light energy into chemical energy.

Explanation:

What is it called when bacteria take in DNA from their environment?
O A. Conjugation
O B. Transduction
O C. Transformation
O D. Transcription
SUBN​

Answers

Answer:

I think it may be C Transformation...I might be wrong though....I'm sorry if I am

Explanation:

Answer:

I believe it's C. Transformation

Explanation:

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