Answer:
Mutation
Explanation:
Mutations can be defined as changes in genetic material, which are the main source of existing genetic variation. For ensuring genetic variability, that is, ensuring that individuals have different DNA, mutations are considered an important point in the evolution of living beings.
It is through mutations that important adaptive characteristics emerge, in addition to essential characteristics remaining in species that are different but that have similarities.
These processes also guarantees the selection of species most adapted species. Mutations can be beneficial, neutral or harmful (genetic diseases or genetic "failures") and, therefore, are not targeted, occurring at <u>random</u>.
Answer is A.
This is an example Mendel’s dihybrid cross.The law of independent assortment of independent assortment. When two individuals heterozygous for both traits (tail color and eyelash length) having genotype (PpLl) are crossed, four types of individuals are produced. The probability of phenotype combinations of offspring is the ratio 9:3:3:1.
9 - polka-dot tails and long eyelashes
3 - polka-dot tails and short eyelashes
3 - solid tails and long eyelashes
1- solid tail and short eyelash
Portland, Oregon, is a city right next to northern west coast of the USA. Besides being very close to the sea, it is also laid on a river. The sun that heats up the ocean and the river leads to evaporation, causing water vapour to ascend, because of a few wind currents, this water vapour is taken to Portland's area where it colds down and condensates, raining over Portland.
Answer:
Acid rain refers to the rain which acidic in nature having a form of precipitation and elevated levels of hydrogen ions (low pH). The normal pH of rain is around 5.6
Rising concentration of Sulfur dioxide (SO2) and nitrogen oxides (NOx) in atmosphere is one of the cause of acid rain. Sulfur dioxide (SO2) and nitrogen oxides (NOx) are released by vehicles, fossil-fuel power plants and oil refineries.
When a sulfur dioxide and nitrogen oxides released in air they mix with oxygen, water and other chemicals in the air and form sulfuric and nitric acids. sulfuric and nitric acids mix with precipitation and its pH level is about 5.2 or below.
Hence, rising concentration of SO2 And NO2x is one of the biggest reason of acid which damages agriculture, buildings and wildlife et-cetra.
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