A mutation in which one nucleotide is substituted for another is called a point mutation.
Plants' chlorophyll (part of plant nutrient generators) turn them green
Answer: directional
Explanation:
Because only one trait was favored. When bears are cold, being bigger helps them better adapt to the coldness. Adjusting to the weather is one trait.
<span>When blood platelets break apart it helps Clotting which in turn can keep someone from bleeding out a small wound for long periods of time thus allowing healing to begin. The platelets respond to broken blood vessels to repair as well.</span>