Answer:
The Earth is 4.6 Billion years old.
QUESTION 2:
Option A is the correct answer.
Hope it helps:)
Answer:
Genes are transferred from parents to offsprings by inheritance. Each offspring receive half of their genes from mother and half from father. But answer of this question is:- Each offspring receive not exactly the same halves of the genes. This different halved of the genes are the reasons we don't.
Explanation:
The only example is with step parents, or others. Half of the parental genes are passed to the child, so a chance for one to look like the uncle or aunt of the family is high. It can also look like any before them, such as a grandmother, father, great grandmother, etc.
Answer:
Allopatric speciation
Explanation:
Allopatric speciation refers to the geographic separation of a continuous genetic background, originating two or more new geographically isolated groups. These divergences of the original population might be related to migration in different directions, extinction of geographically intermediate populations, or geological events. During these events of speciation, emerging new barriers impede genetic flow between groups, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
Different stages are involved in the allopatric speciation process:
• The emergence of the barrier.
• Interruption in the genetic flow
• Slow and gradual differentiation due to the occurrence of mutations in each population and their accumulation in time.
• Genetic divergence by natural selection and reproductive isolation, impeding the two groups to mate even if the barrier disappears.
• Prezigotic isolation mechanisms favored by selection a secondary contact between the new species occurs.
The Panama isthmus is an example of allopatric speciation caused by an extrinsic geological barrier that interrupted the genetic flow between species driving to genetic changes and reproductive isolation.
Two different groups that evolved in allopatry might meet again in secondary contact if the barrier that separated them, disappears. In the Panama isthmus example, the groups that did mate, could not produce any fertile progeny because of postzygotic reproductive isolation. And the groups that did not mate, were not attracted to each other because of prezygotic reproductive isolation.
Sweating and shivering. Sweating occurs when you get too hot and your body is trying to cool you down, shivering is when it's too cold and your body is trying to produce heat.
Answer:
Brooke would likely be diagnosed with major depressive disorder because she's telling herself she has no energy showing lack of interest in what's planned and in other words 'lazy'
