Answer:
cutting a substance into 4 pices
Explanation:
the chemical make up of the substance didn't change and no new things were formed therefore it is a physical change
Answer:
According to Darwin's theory of evolution, new species evolved as a result of natural selection.
Explanation:
- Darwin proposed that speciation could readily occur through the prolonged action of Natural selection.
- Natural selection allows the 'survival of the fittest' i.e. a more fit organism will have a better chance of survival than the less fit one.
- The result of Natural selection could be positive,negative or balancing.
- Evolutionary process in which the genetic changes confer a higher fitness to increase frequency of the organism over time in population is called positive selection.
- Evolutionary process in which genetic changes decreases the organism's fitness resulting in its disappearance from the population is called Negative selection.
- It may happen that a mutation benefits hetero-zygotes but not homo-zygotes and alleles maintain a intermediate frequency in population.This evolutionary process is called balancing selection.
The same general processes occur in meiosis and mitosis
Answer:
The earth would no longer have the mobile surface it has now, gradually eroding flat and water-covered. The sea might eventually evaporate into space or freeze.
