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sergij07 [2.7K]
3 years ago
9

What system does the circulatory system work with to obtain oxygen for the body?

Biology
2 answers:
Nadya [2.5K]3 years ago
6 0

Respiratory system , absorbs oxygen from the air and  mixes it with the blood and pumped back to the heart

Semenov [28]3 years ago
5 0
Respiratory system, because the lungs and diaphragm would get the oxygen from the air, and transfer them to the circulatory system (that's a pretty basic explanation, there's much more to it)
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For which of the following groups would the biological definition of species be useful? For which of the following groups would
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Answer:

B) oaks and other sexually reproducing, extant (currently living) trees

Explanation:

The biological species concept defines the species on the basis of their reproductive isolation. It states that when individuals are able to interbreed to produce fertile and viable progeny, they belong to the same species. The members of different biological species cannot interbreed. If they interbreed, either pre-zygotic or post-zygotic isolation mechanisms do not allow the production of fertile progeny.

Therefore, the biological species concept can be applied to the organisms that are able to reproduce sexually. The asexually reproducing organisms would not exhibit any reproductive isolation which is a key criterion to group organisms under different species. Among the given examples, biological species concept can be applied to the sexually reproducing extant trees such as oak.

Since we cannot deduce the reproductive isolation in sexually reproducing extinct species, the concept is not useful for dinosaurs which are extinct now.

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Answer: The answer is D Increasing climate change

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Which of the following are characteristics common to all plant and animal cells? Select all that apply. an outer membrane or pla
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Outer membrane or plasma membrane, cytoplasm, nucleus, ribosomes,
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Answer:

The cells belong to the tissue level of organization

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A plant leaf is an organ which is made up of various tissues such as the dermal, vascular and ground tissues.

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The given blank can be filled with operator.

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The proteins that assist in turning on or turning off the function of a specific gene by getting combined with certain sections of the DNA are known as transcription factors. The transcription factors that activate the transcription of a specific gene are known as activators, while that prevents transcription and is termed as repressors.  

A repressor can be an RNA or a DNA binding protein, which prevents the articulation of genes by getting combined with the operator. A repressor, which binds with DNA prevents RNA polymerase from getting combined with the promoter, which further inhibits the transcription of the genes into mRNA.  

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