For which of these questions could a testable hypothesis be developed? Check all that apply.
O Does a flu shot hurt worse than a pneumonia shot?
O
Will breeding a red rose with a white rose make a pink rose?
Are pecans better tasting than walnuts?
O Will practice help improve your reaction time?
Whose pulse rate increases more after running up and down a flight of stairs, that of an adult or child?

individual oxygen atoms are formed during photosynthesis.-c.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.