Answer:
Natural Selection.Explanation:
One such situation would be Natural Selection. This involves the weaker individuals of a population dying off while the stronger ones continue living long enough to reproduce and pass on their stronger genes. This occurs naturally in every species and determines how a species evolves over time, therefore providing very valuable information. However, performing this as an experiment would involve killing off the weaker portion of a population or allowing them to die which would be unethical.
Answer:
B) This view is seen when you are standing in the umbra only.
Explanation:
Answer:
The amount of carbonate, a main building block in sea water, is reduced by ocean acidification. This makes it harder for marine organisms to shape their shells and skeletons, such as coral and some plankton, and existing shells will begin to dissolve.
Http://teachingamericanhistory.org/lessonplans/act1/
this link should help you
