Answer:
Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together.
This distribution of fossils led to theories that the southern continents were once joined in a supercontinent called Gondwana.
Fossils tell us when and where plants and animals once existed. Some life "rode" on diverging plates, became isolated, and evolved into new species. Other life dispersed to new areas as continents reconnected, oceans narrowed, or chains of volcanic islands formed. Finding identical or similar fossils in areas separated by vast distances were some of the first clues that scientists used to reconstruct past plate movement. This distribution of fossils led to theories that the southern continents were once joined in a supercontinent called Gondwana.
This relates to Mendelian genetics and the concept of dominant and recessive alleles in a diploid gene. Under this understanding, you could say for example that the allele for light coloured moths is L whereas that for dark coloured moths is l. If l is recessive to L, then moths of the genotype LL and Ll would remain lightly coloured, whereas moths with the genotype ll would be dark coloured. Even if the environment selected out dark coloured moths, these would only be the moths with the genotype ll, and those remaining, LL and Ll, could still cross to produce LL, Ll and ll genotypes. This is how dark coloured moths can remain in the population even though they are actively selected against.
Answer:
To make it into DNA A pair with T ,C pairs with G. In mRNA, A pairs with U, instead of T.
Hope this helps
Explanation:
The correct answer is a residual phase of schizophrenia.
This phase is demonstrated when the patient is no longer showing any conspicuous signs. In such cases, the schizophrenic symptoms usually have lessened in severity. The delusions, idiosyncratic behaviors, or hallucinations may still be persisting, however, their appearances are substantially reduced in comparison to the acute phase of the illness.
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.