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Which ecosystems are most likely to remain stable over time?
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
Following the volcanic eruption in 1980, which process occurred that resulted in an increase in the number of species?
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
A substance that is essential to the functioning of all cells is most likely coded for by gene
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
Identify the pattern of chromosomes possible in the tadpole offspring from these parent frogs.
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
Different cell types can arise from genetically identical embryonic cells because
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
This discovery illustrates the concept that
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
Which explanation is consistent with the data collected?
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
Individuals who contract a disease caused by a strain of a drug-resistant bacteria are at risk. This is because, when they are treated with certain antibiotics,
fresh water and seawater because more species in an ecosystem increases the variety of genetic material available
A
The increased mass of the willow tree was the result of the tree taking in materials from its environment.
2
the resistant bacteria survive in greater numbers and pass the trait to their offspring
different cells have the same genes, but the same genes aren’t expressed in all cells
ecological succession
scientific explanations are tentative and subject to change as new discoveries are made
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