Answer: technology
Explanation: he practical use of science is called is technology. Technology is the practical application of scientific knowledge
A scientis could see the DNA and probably not know the exact age but a close guess to how old he is
Answer:
concentration gradient
Explanation:
concentration refer to number of ions on either side of membrane
gradient :difference in concentration on both sides of membrane
on this basis:
one side of membrane: higher concentration of h+ ion
other side of membrane :lower concentration f h+ ions
pumps transport ions from higher concentration side to lower concentration side of membrane