The layer of atmosphere near the surface of the earth is the troposphere and the other layers are above the earth atmosphere these are mesosphere, and stratosphere.
- The troposphere is suitable for flying of the birds as the temperature is suitable for their survival but layers of the mesosphere and stratosphere have lower temperature than the troposphere.
- Nearly all water vapor and dust particles are present in the tropospheric layer but the quantity reduces in the mesosphere and stratosphere.
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Answer:
The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
Alveoli are tiny sacs which form the site of gas exchange in the lungs.
The features of alveoli which help in gas exchange are:
- They increase the surface area in the lungs thus, more space is available for gas exchange.
- They have very thin walls, as thin as the thickness of a single cell only.
- They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.
Answer:
The answer is due to oxygen deficiency
Hope this helps you.
Answer:
In the center of the stream well above the bottom of the bed or channel but below the surface.
Answer:
ALL OF THE ABOVE
Explanation:
Genetic Drift are the changes in allele frequency of a population that result from RANDOM survival or reproduction of individuals with certain characteristics. Survival or reproduction of those individuals in the face of some environmental change is a matter of LUCK or CHANCE, not because of their phenotype or genotype.
While in Natural selection, the environmental events that affect a population are likely random, but the survival or reproduction of the individuals depends on their phenotypes and genotypes.
Meanwhile, Gene flow is the movement of genes into or out of a population. Low gen flow can lead to low genetic diversity.
Low population which can cause low genetic diversity, poor habitat conditions and habitat loss, road deaths, and commercial development in panther range are constant threats to the Florida Panther's survival.
All these causes are related and therefore affects the Florida Panther.