How can students in the photograph use the net to sample the invertebrates in the river.
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Answer and Explanation:
Macroinvertebrate communities show spatial and temporal variability. Many taxons have more affinity for one specific type of habitat.
There are two principal sampling techniques. Qualitative and cuantitave. Qualitative techniques provide data about the river richness and the relationship between the different taxonomic group's abundance. They allow the obtention of the most representative and abundant taxons, estimates their densities, biomass, and calculates the diversity indexes for each sampling site by period. Nets are needed to sample.
Every possible microhabitat must be sampled. The use of the different sampling elements depends on the substrate.
Hard-substrated sites, such as rocks or wood and organic matter, are sampled using a Surber net. The net is placed counter-current. The substrate must be moved and removed up to 10-15 cm deep, checking that animals and the thin sediment lie on the net. Samplings must be done from downstream to the upstream direction, taking replicates per substrate. Invertebrates must be washed on a strainer. Finally, place each of the samples in a plastic bottle, fixate the material with formaldehyde 4% and take it to the lab for its taxonomic identification.Related Questions
Crude oil escaped from the well at an average rate of barrels per day. Calculate how many barrels of 60,000 crude oil flowed from the well from May 1 to May 31, 2010.
Answers
Answer:
1,800,000 barrels
Explanation:
60,000 barrels x 30 days
Genetic variation is inherited by offspring.
A. Artificial aelection
B. Natural Selection
C. Both
Answers
Answer:
Both
Explanation:
A person's skin color, hair color, dimples, freckles, and blood type are all examples of genetic variations that can occur in a human population. Examples of genetic variation in plants include the modified leaves of carnivorous plants and the development of flowers that resemble insects to lure plant pollinators. Even though in artificial selection, you take which genes are desired it is still passing genetic variation through offspring.
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Answers
The speed of an object at a particular moment in time is known as the........
A. instantaneous speed
B. instantaneous velocity
C. Speed
D. Velocity
Answers
Answer: It would be A. Instananeous speed
Explanation: It is measured in metres per second
20 Points!!!! Answer ASAP!!! Describe the process of oil extraction in complete sentences. Be sure to include information about how the process has changed in recent years.
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STEP 2: DRILLING
First the drill rig is brought to the location—maybe 20 or 30 truck loads—and put together. Now It’s time to build the infrastructure necessary to unlock the oil and natural gas trapped more than a mile below the ground. A well is drilled straight down into the ground beneath the pad. The first stage is to drill what is called the surface hole down to a depth of 100 feet below the deepest known aquifer. A steel casing is then
Oil extraction is the process of recovering crude oil from underground reservoirs, in recent years, the process of oil extraction has changed, with new technologies and techniques allowing for more efficient and cost-effective oil production.
What is oil extraction?
The process of oil extraction involves drilling wells into the earth and then using various techniques to bring the oil to the surface, and the first step in oil extraction is to identify a suitable location for drilling, which is typically done using geologic surveys and other exploration techniques to locate areas with the potential for oil reserves, next step is to complete the well by installing a casing that helps to prevent the well from collapsing. Technologies such as "hydraulic fracturing," which involves injecting water and sand and assisting in the release of trapped oil and gas, have recently gained popularity.
Hence, it is the process of recovering crude oil from underground reservoirs, in recent years, the process of oil extraction has changed, with new technologies and techniques allowing for more efficient and cost-effective oil production.
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When an enzyme was added that destroyed carbohydrates from the heat-
killed S strain and added to the live R strain, did transformation occur? (Did
transformation happen without the carbohydrates?)
Yes or No
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Bobcats are generally solitary and establish territories of a certain size where they hunt for food. What type of population dispersion would you expect bobcats to have?
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Answer:
Uniform dispersion.
Explanation:
The bobcats' population distribution would be a uniform dispersion because they are distributed in an area in a balanced way. That is to say, that there is space between them and that each bobcat establishes its personal space when hunting and for their daily life. As they are solitary animals, they do not live in groups and only associate with other bobcats to reproduce themselves.
Kingdom Animalia:
Question 9 options:
Eukaryotic
Prokaryotic
Unicellular
Multicellular
Autotrophic
Heterotrophic
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Answer:
Eukaryotic
Prokaryotic
Unicellular
Multicellular
Autotrophic
Heterotrophic
Explanation:
-organism having nucleus
-organism without nucleus
-organism having one cell
-organism having many cell
-Organism that can make their own food
-Organism that cannot make their own food.
This tree is dying in the dry environment. What ABIOTIC limiting factor is affect the tree? please help
Answers
Forensic scientist Bennet asks his technician for the scalar quantity of fingerprints found at his crime scene. What would be the technician's most likely answer?
There were 13 fingerprints found at the crime scene.
There were fingerprints in the hallway facing the direction of the kitchen and fingerprints in the kitchen pointing toward the door handle.
There were individual prints dusted at the crime scene, but they have not been identified yet.
There were fingerprints found in the bedroom, some that look like they are sliding down the hallway, and prints leading to the refrigerator.
Answers
Answer:
first answer is correct
Explanation:
just took the test
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Allows sugars and salts to pass through the membranes
is this a transport protein market protein or receptor protein?
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Answer:
selective membrane
Explanation:
i think this is what you are asking
I’ll really appreciate it if you help me out with these 2 questions .
Answers
Answer:
8. C
9. Im sorry I don't know
Which structure does the immune system target in type 1 diabetes?
a. beta cells of the pancreas
b. liver cells that release glucose
c. insulin receptors on fat cells
d. red blood cells in the bloodstream
Answers
Answer:
The thymus plays an important role in deletion of potentially autoreactive T cells. However, the presence of islet-specific T cells in the circulation of type 1 diabetes patients and healthy subjects indicates that the thymus is not capable of efficiently deleting all autoreactive T cells (Mathis and Benoist 2009).
Explanation:
Answer:
A: beta cells of the pancreas
Explanation:
Type 1 diabetes makes the pancreas produce little to no insulin.
True or false. Without wind there would be no weather.
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Answer: Absent a gentle breeze or mighty gale to circulate both warm and cold weather around the Earth, the planet would become a land of extremes. Areas around the Equator would become intensely hot and the poles would freeze solid. Whole ecosystems would change, and some would completely disappear.
What is the dynamic of type 1 diabetes process concerning cellular disruption and what is its effect on the major body systems?
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Answers
Explanation:
Type 1 diabetes occurs when some or all of the insulin-producing cells in the pancreas are destroyed. This leaves the patient with little or no insulin. Without insulin, sugar accumulates in the bloodstream rather than entering the cells. As a result, the body cannot use this glucose for energy.
In most people with type 1 diabetes, the body's immune system, which normally fights infection, attacks and destroys the cells in the pancreas that make insulin. As a result, your pancreas stops making insulin. Without insulin, glucose can't get into your cells and your blood glucose rises above normal.18-
Answer:
it cal also contribute to heart problems and kidney problems later on
Explanation:
What impact can planting new trees have on the water cycle?
a: More carbon dioxide is released into the atmosphere b: Transpiration increases
c: Condensation decreases
d: More water infiltrates into the ground
What is the source of energy for all biogeochemical cycles, including the water cycle?
a: winds
b: gravity
c: the Sun
d: volcanic eruptions
Which of the following statements about the water cycle is TRUE
a: Plants do not influence the water cycle
b: Precipitation that falls to the ground can end up as groundwater
c: The water cycle only continues during daylight hours
d: Once water flows into the ground, it is stuck there forever
Which of the following happens as a result of eutrophication?
a: excessive growth of algae b: increased bacterial growth c: decrease in oxygen levels d: all of the above
Answers
Answer:D,C,
Explanation:
Q1)Trees increase the ability of the soil to retain stormwater by absorbing water from the ground. The roots also help to break up compacted soil as they expand, allowing water to flow more easily downward into the groundwater level.
Q2) The Sun's energy drives the water cycle. The sun warms the ocean's surface and other bodies of surface water, allowing liquid water to drain and ice to sublime (transform from a solid to a gas). These solar-powered processes release water vapor into to the atmosphere.
Thats All I have
Logging involves people cutting down trees to acquire timber for uses such as building homes and making paper. How would logging affect a pine forest ecosystem? Choose the two that apply.
Answers
Answer:
Deforestation
Explanation:
When logging is applied in pine forest the organisms in the ecosystem as to go to extinction
Answer:
It would change the plant populations in the area.
It would change the animal populations in the area.
Explanation:
Which phase of cell division is shown?
Exploring mitosis.
anaphase II
telophase I
prophase I of meiosis
telophase II
Answers
Answer:
im assuming its the same question i had, i took the quiz and the answer was telophase I
Explanation:
like i said i took the k12 quiz and got 100%
The phase shown here is anaphase. the correct option is A.
What is anaphase?Anaphase is the stage of mitosis that occurs after metaphase, during which replicated chromosomes are split and newly replicated chromosomes are moved to opposite poles of the cell.
The missing image is attached below.
The image is showing the split of chromosomes, so it is indicating anaphase of cell division.
Thus, the correct option is A.
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Why is it important for older adults to get a colonoscopy?
Answers
Answer:
The older you get the greater chance you have for colon cancer.
Explanation:
Answer:
It is important for older adults to get a colonoscopy to check for any signs of cancer.
If the organisms were put in a dichotomous key for dassification, what would makethe organisms in the diagram different
from organisms that fall under the taxonomic group Bacteria?
A The organisms in the diagram are autotrophs.
B. The organisms in the diagram are unicellular.
C The organisms in the diagram are mobile and move with flagella,
OD The organisms in the diagram contain membrane-bound organelles,
Type here to search
Answers
Answer:
98.9% sure it's B. as far as I know
anyone know these please help me out i need a lot of help
Answers
Answer:
1. False
2. True
3. True
4. True
Explanation:
1. Not all mutations are bad! Some actually can provide people with advantages.
2. Back to number 1, yes! Some mutations can give you advantages that people would not normally have.
3. Yes! Melanin helps protect our skin from damage from UV rays from the sun. This is why people with lighter skin tend to “tan” or “burn”.
4. Yes! Mutations are often a random process. We cannot determine whether or not someone will be born with or without a mutation.
What are disadvantages of the "Aoudad"?
PLEASE ANSWER ASAP!!
Answers
Answer:
Anecdotal reports suggest aoudad out compete native big game species for food, water, and cover as well as act as a disease reservoir on Texas landscapes. If significant overlap for resources and space are occurring among aoudad, desert bighorn and mule deer, aoudad could outcompete and outgrow native populations.
Explanation:
A strand of DNA reads: ATGGCGCTTGACA. What is the sequence of the complimentary (opposite) strand?
Answers
Answer:
TACCGCGAACTGT
Explanation:
Hope this helps! Just remember the base pairs for DNA C=G and A=T
Doctors often use certain medications to treat infections. A few people have a reaction to some of these medications, such as itching, swelling, or trouble breathing. This is an example of
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Answer: The body’s immune system overreacting to a usually harmless substance.
A reaction to some medications, such as itching, swelling, or trouble breathing is an example of hypersensitive reaction (drug allergy).
What is drug allergy?It a an allergic reaction of the body towards a medicine.
What kind of reaction is a drug allergy?It is a kind of hypersensitive reaction.
What is a hypersensitive reaction?It is an exaggerated response of a body towards an immunogen.
Why is it caused?When drugs bind to some immune cells such as T cells, they cause a release of some chemicals which causes an allergic reaction in the body.
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In the past, pacific sea otters were hunted to near extinction.
Without the otters, kelp forests along the coast started to die
because sea urchins, the otter's favourite food, were able to
overgraze them. Once otters became protected, the kelp
forests began to recover as the urchins were back in check.
In this kelp forest ecosystem, sea otters are a ________
species.
Enter the answer
Check it
Answers
Answer:
Keystone
Explanation: keystone
Please help if you answer correctly i will give brainliest
Answers
Answer:
1) Chicken: Codominance
2) Zebra: Independent assortment
3) Flowers: Incomplete dominance
4) Dalmatian: Law of segregation
Explanation:
Due to technical problems, you will find the complete explanation in the attached files
Overtime, plants will compete, and recreate the forest.
This principle is known as...
?????
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Answer:
ecological succession
Explanation:
Answer:
Ecological succession
Photosynthesis requires light, water, carbon dioxide, and
____.
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How does movement along faults change the Earth’s surface?
Answers
Earthquakes are the result of sudden movement
along faults within the earth that releases stored
up elastic strain energy in the form of seismic
waves that propagate through the earth and
cause the ground surface to shake..
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