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3 years ago

An ecosystem consists of a

Biology

2 answers:

ivanzaharov [21]3 years ago

3 0

Answer:

biological community

Explanation:

andre [41]3 years ago

3 0

A biological community of interacting organisms and their physical environment

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Analyze the data about nitrogenous base content of DNA from various species. Percentages of Bases in Five Organisms Source of DN

Troyanec [42]

Answer:

When analyzing data on the nitrogenous base content of the DNA of various species, the claims are supported by the data:

In any one species, the amount of adenine closely approximates that of thymine.
In any one species, the amount of guanine closely approximates that of cytosine.
The amounts of A, T, G, and C in DNA varies from species to species.

(options A, B and D)

Explanation:

Organizing the data has to:

Source of DNA A T G C

Streptococcus 29.8 31.6 20.5 18.0

Yeast 31.3 32.9 18.7 17.1

Herring 27.8 27.5 22.2 22.6

Human 30.9 29.4 19.9 19.8

E. Coli 24.7 23.6 26.0 25.7

DNA is the molecule that contains the genetic information of each species, formed by sequences of nitrogenous bases Adenine, Thymine, Cytosine and Guanine.

Since Adenine and Thymine -as well as Cytosine and Guanina- are complementary, the percentage of them will be very similar in each DNA molecule.

The genetic information -which determines the physical and functional characteristics of each organism- is encoded in the DNA and is different for each species, so the percentages of nitrogenous bases vary from species to species.

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3 years ago

List several commercial applications of ethylene gas.

OlgaM077 [116]

Answer:

The commercial application of ethylene gas are as follows:

The ethylene gas are important for the early ripening of fruits.

The elongation of shoot can be done by ethylene gas.

The flower stimulation and swelling of stem can be achieved by the use of ethylene gas.

The leaf abscission of ornamental plants can be done by the use of ethylene hormone.

7 0

3 years ago

Read 2 more answers

Which is a phenomenon that can result from directional selection? a. There is an increase in the number of different breeds of d

anzhelika [568]

Answer:

B) There is an increase in the number of giraffes with long necks in areas of Africa where low-growing trees have died

Explanation:

The directional selection is one of the ways of the natural selection in which the natural selection selects or favours the most extreme trait of the species and the extreme trait show higher fitness than the normal or average trait.

In the given question, the case of Giraffe necks shows directional selection as the normal length of the neck is not favoured by the environment but the extreme trait that is long neck is favoured by the environment and the selection shifted to that level.

Thus, Option-B is the correct answer.

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2 years ago

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Choose the answer that best completes the sentence. ______ zebra mussels can live six or seven years, now it seemed that most we

stiks02 [169]

Answer:

Explanation:

A. Since

B. Because

C. Although

D. For example

Zebra mussels have been known to have a lifespan of six or seven years in the past but recent discoveries have shown that their average lifespan now ranges between one to two years. Hence, the correct word to fill in the gap would be 'Although'.

The correct option is C

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2 years ago

How do cells behave in a multicellular protist?

Sindrei [870]

Answer:

2.They exhibit cell specialization.

Explanation:

A protist is an eukaryotic organism that can either be unicellular or multicellular. In the multicellular protist i.e. many cells, different types of cells are needed to bring about the organism's life processes. The different types of cells perform a specific different function in the organism.

The way that an organism makes it cells specialized to perform different functions is called Cell Specialization or differentiation. All multicellular organism, including a multicellular protist, contain many cells that have been specialized to perform different functions. Hence, the many cells of a multicellular protist will exhibit specialization in order to perform varying functions in the organism.

7 0

3 years ago

Read 2 more answers