A scanning electron microscope would be the best choice for a scientist examining the living cells lining the respiratory tract. This is due to its capability of scanning the surface of the whole cells, which is essential to properly observe the tiny hairs on these cells that move dirt and mucus away from the lungs.
To explore living cells lining the respiratory tract, the best instrument would likely be a scanning electron microscope (SEM). While both SEM and transmission electron microscopes provide high-resolution images, a key difference is how they interact with the specimen. The SEM scans the surface of whole cells, making it ideal for observing the tiny hairs, or cilia, on the cells of the respiratory tract. These tiny hairs move in coordinated waves, pushing mucus and trapped particles out of our lungs. This process can be best observed on the whole cell surface, which is why SEM would be preferred.
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b. two molecules of DNA
c. two large DNA samples
d. two cups of liquid
b. inheritance of acquired characteristics
c. natural selection
d. survival of the fittest
5. Charles Darwin called the ability of an organism to survive and reproduce in its specific environment
a. diversity
b. fitness
c. adaption
d. evolution
6. Similar patterns of embryological development in different but related organisms are responsible for the formation of
a. homologous structures
b. analogous structures
c. Hox genes
d. intermediate fossil forms
7. If an allele makes up one half of the frequency of a population's allele for a given trait, its allele frequency is
a. 100 percent
b. 75 percent
c. 50 percent
d. 4 percent
8. The frequency of phenotypes for a typical polygenic trait is most often illustrated as
a. a scatter plot
b. a bell-shaped curve
c. a pie chart
d. a histogram
9. Which of the following events do biologists consider a random change?
a. directional selection
b. speciation
c. disruptive selection
d. genetic drift
10. Which of the following statements defines the members of a species?
a. They are temporarily isolated from each other
b. The are geographically isolated from each other
c. They mate and produce offspring
d. They have identical genes
4. The correct answer is option "B" which is the inheritance of acquired characteristics.
5. The correct answer is option "C" which is an adaption.
6. The correct answer is option "A" which is homologous structures.
7. The correct answer is option "B" which is 75 per cent.
8. The correct answer is option "B" which is a bell-shaped curve.
9. The correct answer is option "C" which is a disruptive selection.
10. The correct answer is option "D" which is that They have identical genes.
Homologous structures are similar physical features in organisms that share a common ancestor, but the features serve completely different functions.
Thus, the following are the answers to the given questions.
To learn more about Homologous structures click here:
A. gram
B. pint
C. quart
D. gallon​
Answer:
gram
Explanation:
A Gram is an internationally agreed unit of measurement.
b.oxidation of iron, also known as rusting
c.oxidation of carbon compounds during cellular respiration
d.oxidation of inorganic matter by microorganisms present in the soil
Answer:
its c
Explanation:
b. tundra
c. forest
d. desert