Dirt
Dirt is a big cause of pollution in our rivers and streams. Rain washes dirt into streams and rivers. Dirt can smother fish and other animals that live in the water. If plants can't get enough sunlight because the water is murky, they die.
Most of the dirt washing into lakes and streams comes from exposed earth. This exposed earth includes plowed fields, construction sites, and areas that have been logged or mined. Some of the dirt polluting streams comes from the stream banks.
The solution is to stop the dirt from getting into the stream in the first place by disturbing the land as little as possible. Farmers and construction workers are using new methods to reduce the amount of earth they disturb.
Bacteria
water pollution
Bacteria are also a big water quality problem. Not all bacteria are harmful, but germs and viruses that can make you sick might be in the water. Bacteria can come from combined sewers after rainstorms and runoff of animal waste from farms, pets, and wildlife.
Sewage systems can be improved to keep untreated sewage from overflowing. Farmers are developing better ways to manage livestock manure. Dog owners are picking up after their pets.
Nutrients
Nutrients are element needed for animal or plants to grow. The two most common nutrients found in water are nitrogen and phosphorus. They cause algae to grow and can turn the water green.
The major sources of nutrients are runoff of fertilizers from farms and lawns, animal waste, sewage treatment plants, and septic systems.
Farmers, homeowners, cities, and towns are all working to reduce the amount of nutrients that get into rivers and streams.
Ponds, Lakes, and the Sea
Water in streams and rivers flows into ponds, lakes, and the sea. Keeping streams and rivers clean helps keep all the water downstream clean, too.
What is a Cladogram?
Answer:
a branching diagram showing the cladistic relationship between a number of species
The evolution of the peppered moth over the last two hundred years has been studied in detail. Originally, the vast majority of peppered moths had light colouration, which effectively camouflaged them against the light-coloured trees and lichens upon which they rested. However, due to widespread pollution during the Industrial Revolution in England, many of the lichens died out, and the trees which peppered moths rested on became blackened by soot, causing most of the light- coloured moths to die off due to predation. At the same time, the dark-coloured moths flourished because of their ability to hide on the darkened trees. Since then, with improved environmental standards, light-colored peppered moths have again become common, but the dramatic change in the peppered moth's population has remained a subject of much interest and study Which type of selection is illustrated by the peppered moth's during the Industrial Revolution?
Answer:
Directional selection
Explanation:
The phenotype of individuals and the environment where they live, interact and determines the genes´ destiny in space and time. The result of this interaction and the gene destiny is Natural Selection. Natural selection selects beneficial alleles and increases their frequency in the population.
Among the different types of natural selection, we can find "directional selection".
Directional selection increases in the proportion of individuals with an extreme phenotypic trait, in this case, dark moths color. This selection presents more frequently in those cases in which interactions between living organisms and the environment modify in the same direction.
In the exposed example, the moth population must be adapted to its environment. The coloration is related to survival strategies. In the beginning, they expressed light coloration useful to camouflage and to avoid predators while resting on their lighted-substrate (lichens and light-colored trees). After the severe environmental impact of the Industrial Revolution, the environment changed. This change acted as a selective pressure. Lichens died, and trees became darker. Light moths were exposed and died after predation. Probably at one point of the evolution, the gene for color mutated, and dark-colored moths appeared. By natural selection, the mutation got fixed. This example reflects directional selection because the population turned from light color to dark color.
In the attached files you will find two graphs expressing directional selection.
According to the weather map seen here, we could expect weather conditions in Memphis to include
Answer:
Explanation:
A. Warmer tempartures,clearing
Answer:
Warmer temperatures, clearing.
Explanation:
I took the test :)
Help please confusing
Answer:
Learned
Explanation:
Only this answer makes sense.
What photosynthesis product has the sunlight energy stored in it?
A. Oxygen
B. Sugar(glucose)
C. Carbon dioxide
D. Water
Answer:
the answer is B
Definition of photosynthesis
Look at the comment under this question
Please help, will mark brainliest if answered correctly.
If meiosis, specifically independent assortment, crossing over, and fertilization lead to genetic diversity, then how is it that we often see two individuals with no relation, look so much alike? Think doppelgängers.
A coyote has 78 chromosomes in its nucleus. What are the diploid and Haploid numbers of the coyote?
Answer:
I believe that the answer would be 39 and 78
help me please please
Answer:
just as too much or too little light causes yellowing of the seedlings
Explanation:
just as too much or too little light causes yellowing of the seedlings ,too much water or not enough can cause it
Which of the following are techniques to estimate population size?
counting individuals
sampling
mark-and-recapture
population index
Answer:
The Mark-Recapture technique is used to estimate the size of a population where it is impractical to count every individual. The basic idea is that you capture a small number of individuals, put a harmless mark on them, and release them back into the population.
Two important measures of a population are population size, the number of individuals, and population density, the number of individuals per unit area or volume. Ecologists often estimate the size and density of populations using quadrats and the mark-recapture method.
Wildlife managers use 4 general approaches to estimate population sizes of wildlife: total counts, incomplete counts, indirect counts, and mark-recapture methods.
The answer is counting individuals and mark-and-recapture.
The technique counting individuals, sampling, mark-and-recapture, and population index are used to estimate population size.
What is population?A population is the entire set of individuals, whether that group is a nation or a group of people who share a characteristic.
To estimate population size, the following methods can be used:
Individual counting entails physically counting every individual in a population. This method is appropriate for small or sparsely populated areas.Sampling is the process of taking a representative sample of a population and extrapolating the results to estimate population size. This method is best suited for large or densely packed populations.Capturing and marking a sample of individuals, releasing them back into the population, and then capturing another sample later. The proportion of marked people in the second sample is used to calculate population size. This method is appropriate for populations that are difficult to directly count or sample.Population index: This method estimates population size by using indirect measures such as the number of nests or tracks. This method is appropriate for populations that are difficult to observe directly or for counting individuals. It is, however, less accurate than other methods.Thus, all the given options are correct.
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Which biome would animals be adapted to collecting FRUITS in the CANOPY layer of trees?
Answer: the forst or the jungly
Explanation:hope this help
Need the answer quick please thanks
Answer:
id k im not in high school
Explanation:
12. Which macromolecule is involved in how the trait for curly hair is passed
from parents to their children?
O carbohydrate
O nucleic acid
О lipid
O
protein
Answer:
c
Explanation:
edge 2020
The density of ocean water varies from place to place across the Earth. What factors control the density of ocean water?
A. depth and salinity
B. depth and temperature
C. salinity and life-forms
D. salinity and temperature
Answer:
D. Temp and salinity
Explanation:
Question 4
Which of the following is NOT a service that diverse ecosystems provide?
O Soil & nutrient retention
O Diversity of food items
O Water retention
O Animal habat
O Global warming
What do you think a convergent (destructive) boundary is? How do the plates interact with each other?
What is competition? Give example
Answer:
Competition is a relationship between organisms that strive for the same resources in the same place. ... Intraspecific competition occurs between members of the same species. For example, two male birds of the same species might compete for mates in the same area.
Hope it helps!!!
compare and contrast biotic and abiotic factors?
Answer:
There is a difference!
Explanation:
In simple factors:
Biotic - living or used to be living organisms.
Abiotic - nonliving.
HELPPPPPPPPPPPPP!!!
Answer:
i think the answer is the one you clicked on, the first answer.
Explanation:
I don’t understand how we can see the sky and clouds and when your outer space you don’t see the sky or clouds you only see the ocean and the land?
If the population of beetles in model 1 mated naturally would your prediction for the offspring in Question 4 still be valid? Explain.
Complete question:
Model 1 – Controlled (Selective) Mating: (Imagen in the attached files, PNG)
4. If each mating pair has one offspring, predict how many of the first generation offspring will have the following genotypes.
BB Bb bb
7. If the population of beetles in Model 1 mated naturally would your prediction for the offspring in Question 4 still be valid? Explain.
Answer:
7) If the population of beetles in model 1 mated naturally, the prediction for the offspring in Question 4 would not be valid. The number of individuals with each genotype in the F1 would change because there would be other possible types of crosses: Bb x bb, Bb x Bb, bb x bb
Explanation:
Due to technical problems, you will find the complete explanation in the attached files (PDF)
Please help ASAP!!!! 15 points
Answer:
2= cytoplasm
1= cell membrane
3= DNA
Explanation:
That all i know
Anna is creating a model to show atoms  of solid bromine and gases bro mine how should her three models differ.
Answer:
The size of the atoms should vary depending on the state. The mass of the atoms should vary depending on the state.
Explanation:
Are we running out of clean water? And why, explain.
Answer:
well were not running out but not every place has clean water and no we never run out of clean water. theres always clean water
Explanation:
Answer: hm, our planet won't run out of water. fresh water isn't always avaliable when humans need it. half of the freshwater can be found only in 6 countries. more than one million humans live without clean water.
Explanation:
how does adrenal glands overcome the low surrounding temperature at high altitude?
Answer:
The major secretions of the adrenal cortex (Box 4.2) are cortisol (the main ... for steroid synthesis is captured by receptors which bind low-density lipoproteins (LDL) ... It is essential to do this slowly and progressively to avoid precipitating acute
Explanation:
explain what happens during old feild succession
Answer:
If undisturbed, an open field over time will be invaded by shrubs, which in turn will be replaced by saplings, young trees, and eventually a mature forest. Foresters often refer to these phases as the grass and forbs stage, shrub and sapling stage, pole stage, and mature forest.
Explanation:
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Is a pencil a biotic or abiotic matter?
4 The finger-like structure in the wall
of the small intestine through which
food is absorbed into the blood-
stream is called
A duodenum.
B bile duct
C villus.
D pancreas.
E ileum.
Answer:
...................C
[tex]{ \blue{ \tt{option \: (c)}}} \: { \green{ \boxed{ \red{ \sf{ \underline{villus}}}}}}[/tex]
Explanation:-
Villus, plurally called villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. Important villous membranes include the placenta and the mucous-membrane coating of the small intestine.
Y red ballonls and m green ballons were divided evenly amoung three kids. How many ballons did each kid get
Answer:
Each kids will get Y red balloons + M green ballons ÷ 3.
Explanation:
This is because Y red balloons and green red balloons are the total number of balloons present.
The total number of ballons are Y red+M green ballons.
The total number of kids are 3.
Therefore each kids with get the addition of the ballons divided by 3.
Therefore, Y red ballons + M green ballons ÷ 3.
was Dr. Gey's use of Henrietta Lacks' cells unethical? Support
your response with evidence from all three sources,
For the source material please read the Radiolab segment, as well as the two articles on Dr. Gey's use of Henrietta Lack's cells from the biomedical test chapter 3.
Answer:
Dr. Gey's use of Henrietta Lack's cells after 24 years was not unethical due to his effort to figure out what was wrong with cells and why it happened to Henrietta.
Even if he did his intentions were to figure out how to treat cancer and help many people from the lethal condition. His effort made it possible to grown immortal human cells in culture. That help in developing the polio vaccine, and many other milestones.