Answer:
sympathetic
Explanation:
The sympathetic division of the autonomic nervous system is responsible for preparing the body under stress or emergency conditions such as being terrified by a large groundhog. The neurons of the sympathetic nervous system trigger an increase in heart rate, breathing rate to increase the oxygen supply needed by body cells under stress conditions.
Other physiological responses generated by the sympathetic nervous system under stress conditions are dilation of the pupil, increased blood pressure, etc. The sympathetic nervous system generates these responses by stimulating the release of stress hormone from the adrenal medulla. These responses are together called fight or flight response.
Answer:
Crossing over and random distribution of chromosome will lead to random assortment of new combinations of alleles on the same chromosome.
Explanation:
Crossing can be defined as the exchange of genetic material between homologous chromosomes.
Variation can occur when the sister chromatids have mixture of alleles ( paternal).
This leads to genetic diversity.
This genetic variation is the bedrock and foundation of evolution. This bring about differences in different organisms and when organism differs genetically, they will have different level of adaptability and survival instincts. The eventual result of this is survival of the fittest.
The vegetation type is called STEPPE. Steppe refers to the vegetation type in which there are only grassland plains; no trees exist in this eco-region. The countries of the world where this type of vegetation can be found include Russia, Ukraine, Hungary, etc. The steppe biome is a cold, dry grassland that exist in all the continents of the world except in Australia and Antarctica. Humidity level is usually very low in this biome because they are usually located far away from the ocean.
Answer:
50%
Explanation:
DNA replication is a semi-conservative process. It means that after DNA replication, the newly formed DNA molecules have one parental strand and one newly formed strand. The cells in the experiment have DNA with 15N. After one round of DNA replication, each DNA molecule would have one parental DNA strand with 15N and one newly formed DNA strand with 14N.
However, after the second round of DNA replication, each hybrid DNA with strand having 15N and the other with 14N would be unwound. The parental heavy DNA strands would be present in the 50% of the newly formed DNA while the rest 50% of DNA molecules would have both strands with 14N (both light strands).
The negative impact of youth risk behavior considers the risks to youth health and the protective behaviors of health including smoking, drinking<span>, </span>drug use<span>, diet and physical activity. Depending upon one's social circumstance including the location of upbringing and access to education, the risk to health would increase, this could be affected by economic factors, with negative health impact increasing with the less access to resources. This directly impacts on the physical and mental well-being of an individual, with bad diet and lack of physical activity limiting a person's potential in the socioeconomic sphere and confidence and health.</span>
