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ValentinkaMS [17]
3 years ago
15

A scientist who is researching marshes observes that marsh grass, Spartina bakeri, grows to different heights at different locat

ions in the marsh. If the scientist wants to find the reason for this difference, what is the correct first step? Conduct an experiment and change only one variable at a time. Determine which technology would assist most in answering the question. Form a research question based on knowledge of the marsh. Establish a control group for comparison.
Biology
2 answers:
9966 [12]3 years ago
7 0
I belive "form a research question based on knowledge of the marsh," in other words, your hypothesis which is the 1st step in the scientific method after observation (which your scientist has already done)
MAXImum [283]3 years ago
7 0

The correct first step would be to conduct an experiment and change only one variable at a time.

There are generally two types of variables in all the valid research, that is, independent and dependent variables. These variables permit a researcher to find the precise association among the variables.  

Thus, in the given study, if the scientists are aiming to determine the cause of length distinction in the marsh grass, then he has to perform an experiment with the application of independent and dependent variables.  


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An aquatic arthropod called cyclops house and seen your daughter either small or a bar in the alley of for Barb's is dominant in
White raven [17]

Answer and Explanation:

The possible genotype and phenotype are as follows

Genotype                 Phenotype

BbR∧            -            Barbed and not resistant to pesticide

BBRR            -            Barbed and not resistant to pesticide

bbR∧            -             Smooth and not resistant to pesticide

bbRR            -             Smooth and not resistant to pesticide

bb∧∧            -             Smooth and resistant to pesticide

Bb∧∧            -             Barbed and resistant to pesticide

BB∧∧            -             Barbed and resistant to pesticide

5 0
3 years ago
Read 2 more answers
Biological causes of an anxiety disorder include, but are not limited to, __________.
Xelga [282]

Answer:

A) genetic influences and chemical imbalances in the brain

Explanation:

An anxiety disorder is a psychiatric disorder where the individual experiences an excessive and irrational worry in everyday situations. Generalized anxiety disorder, phobias, panic attacks, etc are examples of anxiety disorders.

<em>Anxiety does not have a specific cause, it can be the result of different factors like changes in the brain's chemistry, environmental stress or even genetics.</em>

I hope you find this information useful and interesting! Good luck!

8 0
3 years ago
How many chromosomes does a body cell for the organism (egg and sperm) have?
DiKsa [7]
Growth and repair
creation of gametes (sex cells)
method of reproduction in unicellular organisms
Binary Fission - type of reproduction that occurs in bacterial cells, single celled organism splits and becomes two identical organisms

Chromosomes and DNA

Chromosomes are DNA wrapped around proteins to form an X-shaped structure.



The diagram will help you see the relationship.

1. Chromosomes are found in the nucleus
2. Chromosomes are made of DNA
3. Sections of chromosomes are called genes



DNA - deoxyribonucleic acid (it is the genetic code that contains all the information needed to build and maintain an organism)





Chromosome Structure







Chromosome Numbers

Each organism has a distinct number of chromosomes, in humans, every cell contains 46 chromosomes. Other organisms have different numbers, for instance, a dog has 78 chromosomes per cell.

Somatic Cells - body cells, such as muscle, skin, blood ...etc. These cells contain a complete set of chromosomes (46 in humans) and are called DIPLOID.

Sex Cells - also known as gametes. These cells contain half the number of chromosomes as body cells and are called HAPLOID

Chromosomes come in pairs, called Homologous Pairs (or homologs). Imagine homologs as a matching set, but they are not exacly alike, like a pair of shoes.

Diploid cells have 23 homologous pairs = total of 46

Haploid cells have 23 chromosomes (that are not paired) = total of 23

Homologous Chromosomes



Sex Determination

Chromosomes determine the sex of an offspring. In humans, a pair of chromosomes called SEX CHROMOSOMES determine the sex.

If you have XX sex chromosomes - you are female

If you have XY sex chromosomes - you are male

During fertilization, sperm cells will either contain an X or a Y chromosome (in addition to 22 other chromosomes - total of 23). If a sperm containing an X chromosome fertilizes an egg, the offspring will be female. If a sperm cell containing a Y chromosome fertilizes an egg, the offspring will be male.

Creation of a Zygote

When two sex cells, or gametes come together, the resulting fertilized egg is called a ZYGOTE

Zygotes are diploid and have the total 46 chromosomes (in humans)

Karyotype

A karyotype is a picture of a person's (or fetus) chromosomes. A karyotype is often done to determine if the offspring has the correct number of chromosomes. An incorrect number of chromosomes indicates that the child will have a condition, like Down Syndrome

Compare the Karyotypes below













Notice that a person with Down Syndrome has an extra chromosome #21. Instead of a pair, this person has 3 chromosomes - a condition called TRISOMY (tri = three)

Trisomy results when chromosomes fail to separate - NONDISJUNCTION - when sex cells are created. The resulting egg or sperm has 24 instead of the normal 23.

Other conditions result from having the wrong number of chromosomes:

Klinefelters Syndrome - XXY (sex chromosomes)

Edward Syndrome - Trisomy of chromosome #13
4 0
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Andreas93 [3]

Answer:

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Explanation:

4 0
3 years ago
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Any time a scientific theory is challenged, it means it's not a good theory.Do you agree with this statement? Explain
vfiekz [6]
False. Any time a scientific theory is challenged, it means it's not a good theory. And this statement is not valid. In theoretical models, they are revisited when there are further studies and discoveries found in a certain area where they can be remodeled and reintegrated instead of disregarding its credibility. Models, theories and paradigms are not challenged but rather encouraged, they are supported in many studies since these theories and models were created in order for us to understand a certain phenomenon but it would likely help the scientific society to be updated in the new forms or spheres of improvement rather than discouragement.  



8 0
3 years ago
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