Population Change is going to occur because of many reasons
1) theory in economics (Malthus Theory): when population increased to a large amount than any natural disaster occur to balanced it.
2) Bio theory (Natural Selection): with the new technologies habits of man are changing that results in change in birth/death rate, immunization etc.
3) Food habits are also changing: that causes less immunization and rapid spread of diseases.
4) Wars: as today's mass destructive weapons results in large reduction of population.
A genetic mutation within the population.
Mutation can create new alleles, therfore can change allele frequencies in a population.
Yes, increase in pressure causes the freezing point to drop.
No, refraction occurs because light changes speed when passing from one medium to another. The change in speed causes the light wave to bend, resulting in refraction. If light did not change speed, refraction would not occur.
Toasting bread is a chemical change because the heat causes chemical reactions to occur within the bread, leading to a browning effect and changing the chemical composition of the bread.
Gene mutation causes the phenotype frequency in a population to change after each generation.
Variation in traits within a population is what causes natural selection to occur. When individuals in a population exhibit different traits, those that are better suited to their environment are more likely to survive and reproduce, passing on those advantageous traits to the next generation. This process leads to the gradual change of a population over time.
ecological exclusion
A genetic mutation within the population.
Two types of energy change that can occur in a chemical reaction are endothermic or exothermic. An exothermic reaction causes an increase in temperature and an endothermic reaction causes a decrease in temperature.
resistance
natural selection or genetic drift
Ask your Sociology teacher.....
Mutation can create new alleles, therfore can change allele frequencies in a population.
over population, bad ruler, people moving to different places
it is the tilt of the earth in the suns direction
Forces always occur in pairs. They even have reaction force pairs occur when there is no motion