Regular human body cells contain a total of 46 chromosomes. Therefore, because of meiosis, sperm cells contain _23___ chromosomes.
Regular human body cells, also known as somatic cells, contain 46 chromosomes. These cells undergo meiosis to produce gametes or sex cells, which include sperm cells, each having 23 chromosomes.
In biology, the regular cells that make up the human body, commonly known as somatic cells, contain 46 chromosomes which is characterized as diploid (2n). These somatic cells undergo a process called meiosis, a type of cell division that reduces the number of chromosomes by half, producing gametes or sex cells (i.e., eggs in females and sperm in males). During meiosis, a single diploid cell divides twice to produce four haploid cells. Therefore, human sperm cells, being a type of gamete, contain 23 chromosomes, rendering them as being haploid (1n).
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B. The quake hit the capital city.
C. The quake registered at 7.8 on the Richter scale.
JUL
Answer:
A
Explanation:
Answer:
Ozone
Explanation:
Ozone is a secondary photochemical contaminant, that is, it is formed from primary pollutants emitted into the atmosphere (mainly nitrogen oxides and volatile organic compounds) in the presence of solar radiation.
The photochemical formation of ozone in a given region is the result of a complex chemical process in which, from its precursors (nitrogen oxides and volatile organic compounds), a multiplicity of different species intervene, interacting with each other according to different reactions, resulting in a highly nonlinear final balance. A transcendental consequence of this nonlinear chemistry is that in a given region, and depending on the initial conditions of departure, the action on the different precursors can have very variable consequences, it being possible that it leads both to an increase and a decrease of ozone concentrations.
This makes short-term measures to reduce air pollution in a certain area, of a restrictive type (such as limiting the operation of heat generators, restricting the circulation of vehicles, regulating traffic to make it more fluid, restricting certain industries and activities) they are not as effective with ozone as with other types of pollutants, as they are a secondary type pollutant and may even in some cases produce a counterproductive effect: for example a drastic reduction in traffic, causing a decrease in NOx levels in the atmosphere, can prevent the decrease of ozone levels that had previously formed.
In the fight against ozone it is necessary to apply medium and long-term measures aimed at limiting emissions of ozone precursor pollutants into the atmosphere.
They do not serve short term strategies. Medium-long term strategies for the reduction of ozone precursors must be devised:
- Less polluting vehicles (NOx, VOCs)
- Use of public transport (NOx, VOCs)
- Energy saving (NOx)
- Use of non-polluting energies (NOx)
- Reduction of solvent use (VOCs).
Answer:
Explanation:
Although no scientist has been able to discover with 100% certainty the cause of extinction of primates in relation to different periods of the planet. These extinctions are believed to have occurred as follows:
Pilocene is considered the least ancient period. In that period the vegetation was similar to the vegetation we know today. However, this period is marked by the cessation of exchange of currents between the Atlantic and Pacific oceans, which resulted in climatic changes that many primates were unable to adapt and ended up dying.
The period called Miocene is marked by the formation of mountains and the appearance of several mammals. As the fauna in this period was abundant, the vegetation became more repressed and could only be found in specific places. This generated strong competition among primates, causing many of them to find no food and end up dying, or to die due to violent fights over vegetation.
The period called Pleistocene, in turn, is marked by the evolution of the human being. This period featured species of homo erectus, which was a great hunter. As you may have already realized, hunting was essential to the survival of human beings, who probably killed countless primates without taking into account the breeding season, causing primate extinction.
physical characteristics in Latin America?
Explanation:
as the ocean plate is pushed under the overriding continental plate the ocean sedimentary layers are heated compressed and melted the pressure of the converging plates that create the subduction zone forces the Continental play upwards creating mountain ranges such as Andes
perhaps sea water and water from lakes, reservoirs etc.