Organisms (belonging to the same species) may adapt in different ways to better exploit different environments or resources-- survival of the fittest. They also may evolve varied characteristics for attracting mates for reproduction. This means that different groups evolve differently. Over time, these groups or populations may become so different that they can no longer breed together -- and separate species are formed.
The Europeans 'wrote' the first question
Francis, who is a miserable cook, is looking for a spouse who is a wonderful cook. Francis's preference for someone who cooks well best supports the hypothesis of the Complimentary need in human mating.
For example, let's say you have a bad breakout in the morning after eating a lot of greasy food. A hypothesis is an educated guess while using reasonable thinking, about the answer to a scientific question.
A hypothesis is a concept or idea that you test through research or experimentation. Predictions that can be verified by research. Most researchers formulate a hypothesis at the beginning of a study. January 9, 2018
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Answer:
<em>John is 20 and Mary is 15.</em>
Explanation:
Let John = X and Mary = Y be the present age.
X = Y+5
2(X+10)-(Y+10) = 35
2(Y+5+10)-(Y+10) = 35
2Y+30-Y-10=35
<u><em>Y=15</em></u>
<u><em>X=20 </em></u>
Therefore: 2*30-25=35
In other words, in ten years' time, Johns age will be double the age of Mary: 30=2*15"