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LenaWriter [7]
3 years ago
7

Classify these examples of symbiosis by type and explain your choice: 1) Inside a human’s intestine live bacteria that make vita

min K; 2) A human picks up bacteria on his or her hands. The bacteria do not cause disease but do feed on the human’s dead skin cells; 3) A tick attaches itself to a human and feeds on the human’s blood.
Biology
2 answers:
kumpel [21]3 years ago
5 0
3 is parasitism, 2 is mutualism, and 1 is commensalism.
Aneli [31]3 years ago
3 0

The right matches are:

1. is Mutualism

2. is Commensalism

3. is Parasitism

Mutualism is an interaction between two species, in which both organizations benefit from this relationship. This is called a mutual benefit interaction. However, mutualism in the strict sense is not a binding relationship between the individuals involved.

Commensalism is a type of natural and frequent or systematic biological interaction between two living beings in which the host provides some of his own food to the commensal.

Parasitism is a biological relationship between two living beings where one of the protagonists (the parasite) takes advantage of a host organism to feed, shelter or reproduce.

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DNA replication results in two DNA molecules, ________.
Vsevolod [243]

Answer:

1st one should be right

Explanation:

prove me wrong

6 0
3 years ago
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Describe what happens during the process of crossing over
Zanzabum

Answer:

crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis . At that stage each chromosome has replicated into two strands called sister chromatids. The two homologous chromosomes of a pair synapse, or come together. While the chromosomes are synapsed, breaks occur at corresponding points in two of the non-sister chromatids, i.e., in one chromatid of each chromosome. Since the chromosomes are homologous, breaks at corresponding points mean that the segments that are broken off contain corresponding genes , i.e., alleles. The broken sections are then exchanged between the chromosomes to form complete new units, and each new recombined chromosome of the pair can go to a different daughter sex cell. Crossing over results in recombination of genes found on the same chromosome, called linked genes, that would otherwise always be transmitted together. Because the frequency of crossing over between any two linked genes is proportional to the chromosomal distance between them, crossing over frequencies are used to construct genetic, or linkage, maps of genes on chromosomes. Mutations , temperature changes, and radiation all affect crossing over frequency. Under the microscope, a crossover has the appearance of an X and is called a chiasma.

Explanation:

6 0
3 years ago
Is blood (solid blood) visible after evaporation?
QveST [7]

Answer:

yes it could. it can even stain solid surfaces

Explanation:

because blood had iron in it.

6 0
3 years ago
Check all the components of scientific design that you considered in your design. independent variable dependent variable contro
yulyashka [42]

Hello. You haven't shown which project this question is referring to, but I can help you by showing the meaning of each of these terms.

The independent variable is one that does not need to be influenced by any factor to be measured and that acts on top of elements to cause a result to happen. An example of this can be seen in an experiment that wants to analyze the influence of organic fertilizer on the growth of transgenic tomato plants. Organic fertilizer is influencing a result, so it is the independent variable.

The dependent variable is one that needs to be measured through the influence of the independent variable. This variable suffers the action of the independent variable so that it can generate a result. In the example used above, we can say that the dependent variable is the growth of transangenco tomato plants, since this growth depends on the application of organic fertilizer.

Controlled variables are elements of the experiment that remain constant throughout the experiment. They serve to give consistency and stability to the results. Still using as an example the experiment that tests the influence of organic fertilizer on the growth of transgenic tomatoes, we can mention the controlled variables such as: the tomato seeds, the water used to irrigate the plants, the size of the pots, the amount of error, the greenhouse where the plants are being harvested, among others.

The control group is the element of the experiment that does not receive the factor being tested. This element will be used to compare your result with the experimental groups and see if there are any differences between them. An example of a control group will be the pots that will not receive organic fertilizer, but will receive the seeds of transgenic tomatoes.

The experimental group is the element that receives the factor that is being tested in the experiment. It is the main part of the experiment, because it will be responsible for showing the real results of what is being tested. An example of this is the pots that will receive the organic fertilizer and the seeds of transgenic tomatoes.

The large sample size refers to the number of elements that will be tested within the experimental group and within the control group. The sample of each of these groups must be large to avoid the margin of error. The larger the sample, the lower the margin of error and the greater the level of confidence in the results of the project.

The ability to replicate is the ability of the experiment to be repeated in other studies. This is very beneficial, because it allows the results you get to be tested by someone else who can prove them, increase the credibility of your study, or deny them.

The impartial Designi refers to the allocation of your experiment in a way that allows all elements of the experimental group and the control group to have the same resources, without any of them being favored. An example of this may be the location of the transgenic tomato plants in a place with a lot of sunlight. No plant is placed in the shade and its growth is disadvantaged.

7 0
3 years ago
What measurement best describes the results of a scientific experiment regarding distance? A.523 inches B.51 kilometers C.57 mil
Gemiola [76]
<span>The answer if the option B. 51 kilometers. To reply this question you have to use the fact that scientific researches are compeled to use the SI units. Inches are miles do not belong to the SI units and kilograns is not a unit of distance. The base unit of distance in the SI is the meter, but this system permits the use of multiples of ten. kilo means 1000 times this is kilometer is 1000 meters and is accepted as a unit in scientific works. </span>
8 0
3 years ago
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