The correct answer is - southern Africa.
The coal fields found in the southern part of the African continent and the eastern part of the United States are a direct evidence that supports the theory of the continental drift. The reason for that is that the coal found in both locations is the same one, from the same type of trees, formed in the same period. All of those clues suggest that the continents were once merged together, as for starters, the type of tree that gave the basic material for the coal is the same, and trees that are totally the same is almost impossible to be found in separated continents as they will have some modifications that will distinguish them. The climate and period in which the coal is formed is also exactly the same, which also leads to the conclusion that there was once a large connected land mass.
Answer:
africa
Explanation:
b. The time it takes for the nucleus of one atom of a radioactive isotope to split in half.
c. The time it takes for half of the nuclei in a sample of a radioactive isotope to decay.
d. The time it takes for the nucleus of one atom of a radioactive isotope to decay.
The time it takes for the nucleus of one atom of a radioactive isotope to split in half is half life.
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b. False
a. True
This is somehow true. If the climate before, thousands of years ago was in harsh conditions; the same conditions today many organisms would not survive. Hence, certain climate conditions is needed for an organism complex such as mammals, humans and the similar organisms to thrive.
Answer:
A. true (just took test)
B. bone.
C. blood.
D. fat tissu
Answer:
i pretty sure it ovum :)
Explanation:
B) biogeographic isolation affects the changes in gene pools that result from which organisms are breeding
C) biogeographic isolation determines who will win competition for mates
D) biogeographic isolation determines the time that populations will breed
Correct answer: A) bio-geographic isolation affects the random changes that take place within gene pools
The bio-geographic isolation of the species takes place when the geographical barrier work as a distinguishing agent. It takes place when the group of animals, plants and other creatures are not allowed to mate with each other.
The mixing of there genes within the same species is separated by the geographical barrier.
The barrier allows the mating of the species in a different way as compared to the previous one.
Biogeographic isolation allows for the change of gene pools over time as (A) biogeographic isolation affects random changes that take place within the gene pool.
Further Explanation:
Evolution is defined as the process of change in the heritable characteristics. This process takes over in time duration of a few generations. The heritable characteristics are the expressions of genes that are passed on from parents to offspring. Evolution may occur through various processes such as genetic drift, natural selection.
Genetic drift is defined as the variation of the relative frequency of varieties of genotype. There is a chance of disappearance of a particular trait from the population.
Natural selection is defined as a process that results in the adaptation of an organism to its environment in which the individual can reproduce and survive.
Gene pool refers to the collection of all available genes that are available to pass down from parents to offspring in the population of single species. The gene pool determines which phenotypes are present in the population at a given period.
Isolation refers to the process in which organisms of the same species are separated as a result of environmental change. This process occurs so that variation can be brought. When organisms become isolated the two groups are not able to reproduce together so, variations and mutations that are confined only to a group.
The following are the five types of isolation;
• Temporal isolation
• Behavioral isolation
• Ecological isolation
• Geographical isolation
• Mechanical or Chemical isolation
Biogeographic isolation refers to the separation of members of different species through geographical or biological barriers. This isolates the reproductive patterns of the members of the same population and results in the new way of mating in the isolated species. The species that are isolated genetically due to mutations and variations. These isolated groups evolved and lead to the formation of new species.
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Answer Details:
Grade: College Biology
Subject: Biology
Chapter: Evolution
Keywords:
Evolution, genetic drift, natural selection, gene pool, mutations, isolation, phenotype, variations, biogeographic isolation, ecological isolation, temporal isolation, behavioral isolation, mechanical isolation, geographic isolation.
It results in 50% recombinants.
It reduces the percentage of recombinants.
Answer:
It reduces the percentage of recombinants.
Explanation:
The independent assortment of genes gives rise to new gene combination and recombinants. Linkage refers to the tendency of two genes present in the vicinity on the same chromosome to get transmitted together.
Since the linked genes are inherited together, they do not exhibit independent assortment. Due to the absence of independent assortment in linked genes, more of parental types and lesser recombinants are formed.