Genetic divertion occurs with reproductive isolation
Answer:
C. Mimicry
Explanation:
Since mimicry provides potential survival value, the mimic with an adaptation that increases the likelihood of surviving is selected.
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Answer:
D. Groundwater depletion
Explanation:
Groundwater is the water that is found just under the surface of the earth.
The effect of using groundwater to irrigate crops between 1955 and 1977 in the San Joaquin Valley was that there was groundwater depletion as there was scarcity of groundwater, even as the irrigation brought increase in yield.
Activated platelets release chemicals that activate more platelets-describes best the positive feedback mechanism of platelets
Explanation:
A positive feedback mechanism is a type of self-amplifying process triggered by a stimulus that leads to greater change along the same direction.
The steps in homeostasis of blood are – platelet adherence, platelet activation, platelet aggregation, coagulation.
When a blood vessel is damaged or injured, various chemicals are released which cause the platelets to adhere to the walls of the blood vessels. This action causes the platelets to release their own chemicals which stimulate the clotting process furthermore. This process is continuous until the injured bleeding blood vessel is corrected by a clot formation and is an example of positive feedback mechanism.
Platelet activation involves releasing of chemicals like cytokines, chemical mediators and coagulation factors; namely, thromboxane A2, ADP, PDGF, VWF, serotonin etc. Chemicals like ADP, VWF etc are released at high levels with increase in platelet plug formation.
Answer:
Eukaryotic cells contain membrane-bound organelles, such as the nucleus, while prokaryotic cells do not. Differences in cellular structure of prokaryotes and eukaryotes include the presence of mitochondria and chloroplasts, the cell wall, and the structure of chromosomal DNA.