Answer:
Explanation:
1. Humans should worry about atmospheric changes as they can affect their health in the sense of their lungs and other important body organs being damaged.
2. Positive effect of humans on ozone layer:
The fact that humas have stopped using CFCs has helped the ozone layer as these had a bad effect on this layer protecting us.
Negative effect:
One thing causing a bad effect on the ozone layer is carbon dioxide and the fact that humans are using it very often it causes the ozone layer to decrease in size meaning that the ozone layer won't be capable to protect us from harmful gases.
4. Scientists think that we should try stop the amount of carbon dioxide from rising because the increase in carbon dioxide leads to the earth becoming warmer and this can lead to a drastic change in the climate.
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Answer:
The reasons are explained below -
Explanation:
The large finches living on the Galapagos islands are different from the original source population from a nearby islands because of the following reasons -
- A natural selection favored only the large finches because they are more fit to the current environmental conditions.
- A genetic drift has been occurred in the two populations living on the nearby islands.
- Due to the separation of habitat on both the islands, the gene flow between the two islands is reduced.
All the above listed reasons are responsible for the difference in the finches found on the two islands.
Answer:
Whichever hemisphere (the Northern or Southern Hemisphere) is tilted toward the sun receives more direct rays of sunlight (or rays that are closer to perpendicular or a 90° angle). The hemisphere tilted toward the sun also has more hours of daylight than the hemisphere that is tilted away from the sun
Explanation:
For multicellular organisms, mitosis is responsible for growth, replacement of dead cells and tissue regeneration. For the single-celled organisms, mitosis is responsible for asexual reproduction .
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