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Marianna [84]
3 years ago
12

Why do mountaineers become breathless as they reach high altitudes?

Biology
1 answer:
garik1379 [7]3 years ago
3 0

Answer:

C.  Oxygen concentration decreases as altitude increases

Explanation:

Higher altitudes have lower levels of oxygen and decreased air pressure.

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During a drought on the galapagos islands, finches with larger beaks were able to crack the large tough seeds produced by plants
TEA [102]

It is an example of directional selection.

The different kinds of natural selection can influence the distribution of phenotypes within a population. In stabilizing selection, an average phenotype is preferred.

In directional selection, a modification in the surrounding changes the spectrum of the observed phenotypes, and in diversifying selection the extreme values for a trait are preferred over the transitional values. This kind of selection usually pushes speciation.

The directional selection, in the field of population genetics, refers to a mode of natural selection in which an extreme phenotype is preferred over other phenotypes, making the allele frequency to change with time in the orientation of that phenotype.

3 0
3 years ago
Which of the following is responsible for transmitting an impulse across a synapse to another cell? A. Thresholds B. Dendrites C
lesya692 [45]
The one which is responsible for transmitting an impulse across a synapse to another cell is the neurotransmitters. It allows the transmission of signals from one neuron to the next across synapses.

The correct answer among the choices is letter C.
5 0
3 years ago
Why do viruses need a host cell to survive?
sesenic [268]

Answer:

viruses are at the borderline of living and non-living organinsms outside the body of living host they are non-active and they cannot grow without their host

Explanation:

4 0
3 years ago
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Although it has been linked to low birth weight, infant death, and lower intelligence test scores in early childhood, __________
iris [78.8K]
Hello! The correct answer for the blank is: Aspirin.


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5 0
3 years ago
The interaction of which two systems provides the molecules needed for the metabolic activity that takes place at ribosomes?
KiRa [710]

Answer:

The correct answer is (1) digestive and circulatory

Explanation:

Digestive system helps in digestion of complex organic matter present in the food like polysaccharides, proteins, lipids, etc. So due to the function of the digestive system, these complex molecules are converted into simpler forms like glucose, amino acids, etc. Then these simpler forms are absorbed in the body through intestine.

Ribosomes help in the production of proteins which requires amino- acids so the absorbed amino acids are moved into the cells through the circulatory system. Therefore digestive system and circulatory system provide the molecules required for metabolic activities.

6 0
3 years ago
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