Dna of a mouse was analyzed and found to be 35% adenine. what were the proportions of the remaining three nitrogen bases?

Adenine and thymine are always in the same quantity. So if there is 35% adenine, there is also 35% thymine. Combined, these make 70%. The remaining 30% is between the other two bases (guanine-cytosine), which are also in equal amounts. So, each of those has 15%.

To conclude:

Thymine, adenine 35% each

Guanine, cytosine 15% each

the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the   grasshopper had to have consumed a plant with 5,000 calories of energy

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".