60 years is three half life for the substance, so 40*1/2^3=5
Answer:
Freshwater wetland biome
Explanation:
Wetlands are defined as those areas where the land area is mostly covered by water seasonally or annually. The areas remain wet. Freshwater wetlands are a type of biome that is not connected to the ocean. They are found mainly along the boundaries of rivers, streams, and lakes. The water in the freshwater wetland is generally evaporated during the summer season.
This biome is highly rich in nutrients that provide a favorable site for the existence of numerous plants and animal species. The leaves that are detached from the trees are deposited within the soils and also captures and accumulates the organic materials that are eliminated from the large trees within this region.
Hereditary mutation - may be passed to another generation, occurs in gametes, variation that may enhance survival.
Somatic mutation - not passed from generation to generations, occurs in body cells.
Both- changes in DNA.
<h3><u>Explanation:</u></h3>
Mutations are defined as sudden changes in DNA that takes place by changing a particular nucleotide or a portion of DNA, or even a whole chromosome which has potential to change characters of an organism. Mutation was first proposed by Hugo de Vries who is also known as the Father of Mutation Theory.
Mutations can occur in any cell of body. It may occur in somatic cells, or in germ mother cells. But the mutations that occur in germ mother cells are actually the mutations that are carried forward by the gametes into next generations. Mutation in somatic cells get obliterated as the organism dies. And the Mutation in gamete cells are those mutations which are capable to cause variations in progenies which can led to better survival of the progenies.
A : a car driving down a hill
2 is the answer hope this helps
