Answer: A
Explanation:
Oxygen makes up another 20 to 21 percent of our atmosphere. It's essential for life on Earth, and interestingly enough, it is poisonous when highly concentrated. Our concentration of 20 to 21 percent seems just right.
Generation-to-generation change in the allele frequencies in a population is _____.
a. genetic drift b. natural selection c. macroevolution d. mutation e. Microevolution
Answer:
e. Microevolution
Explanation:
Microevolution refers to the small changes in the allele frequencies and the genotype frequencies of the populations. These changes occur over a few generations and deviate the populations from the genetic equilibrium.
The processes responsible for microevolution are mutations, genetic drift, gene flow, etc. Similarly, sexual selection and nonrandom mating also change the allele frequencies of the populations. Likewise, natural selection brings about microevolution by increasing the frequencies of the alleles that impart the beneficial traits to the organisms.
When the mouth opens wide and your chin drops, the movement is known as depression movement, which occurs in the <span>temporomandibular joint. This movement occurs naturally when we are surprised or shocked due to a certain event, it is also considered to be a common facial expression.</span>
The natural selection is the survival of the fittest, which means that o<span>nly the best adapted individuals survive and reproduce, contributing the most to the next generation</span>
According to natural selection, birds such as cardinals , eagles, and ducks have differently shaped feet due to <span>adaptation to different environments and feeding habits.
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Sorry I don’t really know