Answer:
Option A, there is more carbon in the ground in temparate forests
Explanation:
In temperate forests the nutrients are mostly found in the soil including the carbon, while in case of tropical forests these nutrients (including carbon) are up taken by the trees and stored there itself. Now when the tropical forest trees are cut down the carbon reserves with in the trees is destroyed and released in the atmosphere. As per estimate the amount of carbon released by deforestation of tropical forest is much more disastrous than the gas emission of automobiles and industries in the current time.
Hence, option A is the correct choice of answer
evolution
genetic variation
natural selection
Genetic variation is brought about by mutation, genetic recombination, and gene flow in a population. Therefore, option (C) is correct.
The differences in DNA sequences that exist between individuals within the same group are referred to as genetic variation. Both germ cells, which include sperm and eggs, and somatic cells, which include all other types of cells, are subject to variation.
One source of genetic variation is mutations, which can be defined as any alteration in the sequence of genes found in DNA. Gene flow, which can be defined as the movement of genes across various groups of organisms, is still another source. The final cause of genetic diversity is sexual reproduction, which results in the formation of new gene combinations and can be a consequence of sexual reproduction.
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Answer:
genetic variation
Explanation:
I took the test
Answer:
A physical environment with different species that interact with one another and with nonliving things is called an ecosystem.
Ecosystem is the functional unit of nature. An ecosystem can be different in size according to the communities living in that ecosystem. Abiotic and biotic components together make an ecosystem.
Chemical and physical factors come under abiotic components. Physical components like water, air, light, temperature have more effects on the ecosystem than chemical factor.
Organisms are the biotic component of an ecosystem. They can be autotrophs or heterotrophs. Many organisms make a population, many populations combine to form community and many communities combine to form an ecosystem.
Organism↔Population↔Community↔Ecosystem
The correct answer is scanning electron microscope and scanning tunneling microscope.
The SEM refers to a kind of electron microscope, which generates three-dimensional images of a specimen by scanning the surface with a focused beam of electrons. The electrons associated with the atoms in the specimen, generating different signals, which comprise data regarding the composition of the specimen and the surface topography.
An STM refers to an apparatus for imaging three-dimensional image surfaces at the atomic level. In this, good resolution is regarded to be 0.01 nm depth resolution and 0.1 nm lateral resolution.
The STM can be utilized not only in a high-ultra vacuum but also in water, air, and numerous other gas or liquid ambient, and the temperatures spanning from 1000 degree Celsius to zero Kelvin.
Answer:
The correct answer is- Synthesis(S) phase
Explanation:
Interphase is the phase where cells spend most of their time. It is known as the resting phase and contains 3 stages called G1, S, and G2 phase. In G1 phase cells grow in size and produce those enzymes which are required for DNA replication.
In the synthesis phase, the DNA is replicated and gets doubled. This event is very important in the cell cycle because it allows each cell produced after cell division to take an equal amount of genetic material which is identical. Therefore in the cell cycle DNA replication occurs in the synthesis phase.
Answer: The given statement is True.
Nuclear DNA is present in the nucleus of eukaryotic cells. When working with the DNA samples, the best source of nuclear DNA is hair root that anchors the whole shaft of hair. Hair root possesses cells that are called as keratinocytes. These cells are ideal for the extraction of nuclear DNA.
But, DNA is not always available in a hair sample as it can not be extracted from shaft of hair ( since it undergoes cornification that destroys the genetic material of the cells).
Thus, given statement is True.