# Gaseous exchange is best described as?

The exchange of oxygen and carbon dioxide between the alveoli and bloodstream (via passive diffusion)

Explanation:

;)

Answer: The exchange of oxygen and carbon dioxide between the alveoli and bloodstream

Explanation:

I hope this helps

## Related Questions

Rocks that are formed from sediment that has been compressed over time and becomes solid are called ______________ rocks *1 point
igneous
metamorphic
sedimentary
Plzzzzzz help ME NEED IT BY TODAYYY

Metamorphic, :b

Explanation:

Lol, hope this helps ;B

Polydactyly is a rare autosomal dominant trait that is 80% penetrant. What is the chance that a child born to an affected father and a normal mother will have the disorder

The question is incomplete, below is the complete question.

Polydactyly is a rare autosomal dominant trait that is 80% penetrant. What is the chance that a child born to an affected father and a normal mother will have the disorder?

Assume the paternal grandfather is normal.

I will use P to encode polydactyl as it is dominant and use p allele to encode normal phenotype

P= Polydactyl

p= Normal

From what is given in the question,the paternal grandfather is normal and that means that the father of the child receives one wild type allele from the paternal grandfather, however,the father is affected with the disease,hence the genotype is A a but the mother being normal will have the genotype of aa.

That is Parents;

Father Aa × Mother aa

Gametes a a A Aa ( P ) Aa ( P )

a aa ( p ) aa ( p )

So if it is 100% penetrant, that implies that the chances of the affected child is;

(2/4 ) ×100=50%

However, only 80% penetrant is given here,so that is why the chances of the affected is then ; (50/100) ×(80/100) ×100= 40%

That means the affected child chances are 40%.

Polydactyly is a rare autosomal dominant trait with 80% penetrance.

### Explanation:

Polydactyly is a rare autosomal dominant trait that is 80% penetrant. This means that if a person carries the genetic mutation for polydactyly, there is an 80% chance that they will express the trait. Therefore, if the father is affected by polydactyly (carries the gene) and the mother is normal (does not carry the gene), each child they have has a 50% chance of inheriting the gene from the father and a 50% chance of inheriting the normal gene from the mother.

However, if a child inherits the gene for polydactyly from the father, there is an 80% chance that they will express the trait, meaning they will have the disorder. On the other hand, if the child inherits the normal gene from the mother, they will not have the disorder.

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Write an essay on ecosystem productivity​

A ecosystem productivity is a rate of generation of biomass.’’I know this because it states.”In economy productivity refers to the rate of generation of biomass in an economy.This shows that the economy its usually expressed in units of mass per unit.

The evolution of new organs usually builds on preexisting structures that are modified in form and sometimes function. The embryos of fish, amphibians, reptiles, birds, and mammals all have pharyngeal pouches or gill slits. These pouches develop into gills in adult fish and they are used to absorb oxygen from their watery environment. These same pouches become parts of the in_________ humans. a) eyes and lungs
b) ear and throat
c) eyes and nose
d) lungs and heart

lungs and heart

Explanation:

lungs and heart is the answer because human lungs is use for gas exchange during respiration or while you breathe. When humans breathe, the lungs absorb oxygen from the inhaled sir into the blood and carbondioxide leaves the blood when we breathe out. The heart pumps the blood, and oxygenated blood are carried in the blood when air is inhaled and carbondioxide leaves the blood when you exhale. The blood carries nutrients and oxygenated blood. Therefore, lungs and heart work hand in hand in absorbtion of oxygen from it's environment.

Which things need to be present for natural selection to take place? (select all that apply)A.Variation in the population.
B.The ability for asexual reproduction.
C. Competition between organisms.
D. Large amounts of resources.

A & C

Explanation:

Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

YES - A) You must have variation in the population, typically in the terms of "fitness" or having admirable/sucessful traits that make them more likely to reproduce and ensure their own offspring are fit too.

NO - B) It is sexual (not asexual) reproduction that uses natural selection for their offspring. Although some asexual organisms use natural selection, it is ALWAYS used if possible with natural selection to ensure the fitness of characteristics is passed down.

YES - C) Competition is necessary for natural selection to occur. When those who are more physically fit compete, they are more likely to live against their opponent and therefore pass on the trait of fitness.

NO - D) Although resources are necessary, large amounts are not as it does not lead to fighting over them (scarcity) bringing us back to the need for competition above.

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Which is a component of the modern cell theory that was not part of the original cell theory? All organisms are made of cells. All cells are similar in composition and metabolic activities. All cells come from preexisting cells. A cell is the basic unit of structure and function for all living things.

All organisms are made of cells. All cells are similar in composition and metabolic activities. Thus, the correct option is A.

The first theory about cell was proposed by two German biologist Theodor Schleiden and Matthias Schwann in 1839.

### What are the postulates of  cell theory?

The main postulates of this theory are as follow:

1. Cell is the basic structural and functional unit of living organisms.

3. All living organisms are composed of cells.

3. New cells arise from already pre existing cells by division.

Modern cell theory is the new version of same cell theory. It also added that all cells are chemically similar in composition and metabolic activities. Cells contain hereditary materials and energy flow occurs with in cell.

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