Answer:
c) microevolution
Explanation:
Microevolution is the change in allelic frequencies within a population over time.
If natural selection favored birds with beaks and small bodies, that means that the frequency of that phenotype (beak and small body) increased while the frequency of birds with body and large beaks decreased.
In this example we see that in the Darwin's finches population, the allelic frequencies - reflected in the phenotype - changed over time as a consequence of the drought.
Answer:
20 chromosomes
Explanation:
Mitosis is a kind of cell division that results in daughter cells with same number of chromosomes as the parent cell. It involves stages including Prophase, Metaphase, Anaphase and Telophase. In prophase, the Chromatin condenses into Chromosomes.
In Anaphase stage, the 10 chromosomes as mentioned in the question divides into opposite poles of the cell. One individual chromosome contains two sister chromatids, which actually separates in the Anaphase stage. Hence, at the end of the Anaphase stage, there will be 10 chromatids each at opposite poles of the cell. Each chromatid at this stage is considered a chromosome.
Hence, a cell with 10 chromosomes will contain 20 chromosomes (10+10 chromatids on each pole) in the Anaphase stage just before the cell divides into two in a process called CYTOKINESIS.
A marsupial is a mammal that keeps its babies in a pouch, right? So an disadvantage would be that without the mother's protection, they would die completely. They are wayyyyy to dependent on their mothers.
Answer:
Explanation:
The crust below the oceans is thinner than the crust below that continents.
This crust is called oceanic crust. It is predominantly made up of mafic magma which produces basalt and other mafic rocks when they cool and solidify.
The oceanic crust is generally thinner than the continental crust below the continent.
The oceanic crust is about 5-10km thick.
Continental crust is about 30km thick.
In terms of density, the oceanic crust is denser than the continental crust.