B) complement
C) proteins
D) antigens
E) interferons
1- Answer : B (AUG AAA CGU CCU)
2- Answer : B (TAC AAA AGA GGG)
3- Answer : C (GGCGATACG)
The gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. The gray frog was abundant in the woodlands. Because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. In such a case, the
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The gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. This suggests that speciation occurred because of
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Answer:
the speciation of the gray tree frog and the green tree frog in the given scenario is likely a result of natural selection caused by the change in habitat from woodlands to grasslands, leading to differences in their mating calls.
Explanation:
the change in the environment from woodlands to grasslands due to climatic changes led to speciation, resulting in the gray tree frog and the green tree frog having different mating calls. This suggests that speciation occurred because of natural selection.
Here's an explanation of how this process might have occurred:
1. Initially, both the gray tree frog and the green tree frog shared a common ancestor and had similar mating calls.
2. When the climatic changes caused most of the trees in the region to die, the woodlands transformed into grasslands.
3. This change in habitat created a new selective pressure on the tree frogs. The gray tree frogs, which were adapted to the trees in the woodlands, faced difficulties surviving in the new grassland environment.
4. However, the green tree frogs, which had a broader habitat range and could survive in both woodlands and grasslands, were better suited to the new environment.
5. Over time, the gray tree frog population in the grasslands declined, while the green tree frog population thrived.
6. As the populations became isolated from each other, natural selection acted on the genetic variations present within each population.
7. The different mating calls between the gray tree frog and the green tree frog might have developed as a result of sexual selection. Frogs with mating calls that were most attractive or effective in their respective environments were more likely to reproduce and pass on their genetic traits.
8. Eventually, the genetic differences between the gray tree frog and the green tree frog became significant enough that they were considered separate species
b. Frequent volcanic eruptions have caused the Earth's atmosphere to fill with sulfur aerosols dropping the temperature globally by 5 degrees.
c. Multiple ice ages in the 18th century have caused a shift in atmospheric circulation on present day Earth.
d. Over the past 50 years, greenhouse gas concentrations have rapidly decreased in the atmosphere.
Liquefaction
Tsunamis
Subsidence
The answer is liquefication