There are two types of alveolar cells. The type I alveolar cells which lines the alveoli and much more abundant than type II alveolar cells. Then the type II alveolar cells lesser in number but functions differently than type I alveolar cells. Type II alveolar cells secrete surfactant (composed of lecitin and sphingomyelin) for the lungs. Surfactant reduces the surface tension inside the alveoli, preventing alveolar consolidation. This is important as babies with dysfunctional type II alveolar cells (usually preterm babies less than 32 weeks age of gestation) will have respiratory distress syndrome in the absence of surfactant.
Answer:
Protista
Explanation:
In biology, there are said to be six different kingdoms that an organism can be classified under. They include Animalia, Plantae, Fungi, Protista, Archaea/Archaebacteria, and Bacteria/Eubacteria.
With this in mind, you say that a unicellular (single-celled) organism without a nucleus was found in pond water. This would point to the Protista kingdom, which are also known as protists. These organisms are single-celled beings with no big nucleus that are typically found in environments like ponds.
Hope this helped! I will take my 100,000 dollars via wire transfer (or just give this answer branliest)
<span>In the particular
order from
top to bottom , the answers are;</span>
<span>Genetic drift</span>
Gene flow
<span>Natural Selection </span>
<span>Gene flow occurs
during migration where alleles from one population
are introduced to another population hence increasing the population diversity. </span>
Genetic<span> drift occurs when the allelic frequency of a population changes due factors such as calamities and emigration or natural selection.</span>
<span>Natural selection is the force of ‘survival for the
fittest’ that is applied differentially on the population
by nature. </span>
