The cochlea contains organ of cortis which send(s) messages through the auditory nerve to the areas of the brain that are responsible for interpreting auditory information. The Organ of cortis contains the hair cells and nerve receptors for hearing. When the hair cells has been stimulated, it will react to specific sound frequencies. However, only certain hair cells will be stimulated based on the pitch of the sound. The signals produced by the hair cells will turn into nerve impulses which will be sent out by the cochlear portion of the auditory nerve into the brain. This auditory nerve will carry the impulses from cochlea into the mid-brain which is the cochlear nucleus. On other brain pathways that end in the auditory cortex of the brain these nerve impulses were carried.
The predominant hypothesis for why the animals needed some 3 billion years to evolve after the life first appeared on the planet is that the conditions were not right for them to appear.
The life on Earth has appeared much earlier that what we normally assume, and also it has not been evolving very quickly, but instead it has been a very slow and gradual process. The reason for that is that the living conditions on the Earth were much different than what are they now, or anytime from the Cambrian period until the present.
The surface was still pretty hot, and there was intense volcanic activity. The composition of the atmosphere was not suitable for animals to appear at all, and in fact it would have been toxic for them. The water too had chemicals in it that were not providing the right conditions for animals to evolve. It was only after the plants started to appear and managed to make lot of changes in the water, atmosphere, and land, than the animals were able to evolve and develop.
Answer:
160
Explanation:
If p = frequency of dominant allele and q = frequency of recessive allele according to Hardy-Weinberg equilibrium,
p + q = 1
p² + 2pq + q² = 1
where p² = frequency of dominant homozygous genotype
q² = frequency of recessive homozygous genotype
2pq = frequency of heterozygous genotype
Here,
b = 4% = 0.04
bb = 0.04 * 0.04 = 0.0016
Number of individuals in population = 100000
Number of homozygous bb individuals = 0.0016 * 100000 = 160
Answer:
Mountain ecosystem, complex of living organisms in mountainous areas.
The respiratory system is responsible for the exchange of gases between the blood and atmospheric air.
