Insertion or

of genes to produce desired proteins.
Answer: A
Explanation:
Oxygen makes up another 20 to 21 percent of our atmosphere. It's essential for life on Earth, and interestingly enough, it is poisonous when highly concentrated. Our concentration of 20 to 21 percent seems just right.
The answer is true light is one of the forms of electromagnetic energy.
Answer:
Many of the parasitic invertebrates like worms are hermaphroditic.
Explanation:
A hermaphroditic organism can be described as an organism that has bole male and female gametes and can produce both female and male reproductive organs. In animals like snails and worms, hermaphroditism allows either partner to become male or female. While many of the other organism can undergo self-reproduction.
Hermaphroditism can also be seen in plants mainly the angiosperms.
In humans, the people possessing this quality are called intersex humans.