Superposition of strata
Younger
Cross-cutting relationship
Explanation:
Barry says the lowest part of the section must have been constructed before the parts above it based on the principle of superposition of strata.
Using the cracks, the cracks are younger than the wall; Barry used the principle of cross-cutting.
- Relative dating places rock strata based on geologic event.
- Several principle guides the application of this dating method.
According to the principle of superposition "in an undeformed sequence of rock strata, the oldest layer is at the bottom and the youngest on top".
The principle of cross-cutting states that "intrusion and faults are younger than the rocks they cut through".
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They can be really important to earths society
They are difficult to work with... most ppl don’t want to cook
Answer:
B) For a gene under negative repressible control, a small molecule is required to prevent the gene's repressor from binding to DNA.
Explanation:
Operon is usually present in prokaryotes. It has a group of genes being transcribed under the same promoter. So the genes are expressed together when required. An operon can be under negative or positive control. It can further be inducible or repressible.
Under negative repressible control the operon is normally in working condition. Repressor protein is present but unable to bind to the operator. When a corepressor binds to repressor, it is activated and finally binds to the operator halting the transcription process. Hence the small molecule (corepressor) leads to binding of repressor to DNA and not the other way round. A small molecule is required to prevent the gene's repressor from binding to DNA in case of negative inducible operon.
<span>The correct answer is A.
Photosynthesis.
Photosynthesis is referred to as the process where plants use energy from the sun, carbon dioxide, and water to make food. Photosynthesis is largely responsible for maintaining and producing oxygen content of the atmosphere of the earth and then supplies all organic compounds and energy which is necessary for life.
The first photosynthetic organisms which probably evolved in the history of evolution is used as reducing agents, for example, hydrogen sulfide and hydrogen.</span>