Answer: hundreds of millions of years ago
Mutation can be both beneficial and harmful.
A very common beneficial mutation is camouflage and natural selection. The organism will acquire the change and pass it on to their offspring.
A harmful mutation can be diseases or a common harmful mutation, Down syndrome. Which gives a person an extra chromosome.
Answer:
Fourth and Fifth month
Explanation:
The fourth and fifth months formed the major part of the second trimester, and it is characterized by the growth of the brain and central nervous system which shows more alertness and developed faster in a way that appears similar to that of a new baby.
Also, this fourth and fifth month is characterized by growth in other parts of the unborn baby such as an increase in heartbeat, fingernails, hair, eyelashes, and toenails.
Oxygen is required for cellular respiration<span> and is used to break down nutrients, like sugar, to generate ATP (energy) and carbon dioxide and water (waste). </span>Organisms<span> from all kingdoms of life, including bacteria, archaea, plants, protists, animals, and fungi, can use </span>cellular respiration<span>.</span>