The answer is A ( Tetrad )
Answer:
93 billion light years
Explanation:
The proper distance—the distance as would be measured at a specific time, including the present—between Earth and the edge of the observable universe is 46 billion light-years (14 billion parsecs), making the diameter of the observable universe about 93 billion light-years (28 billion parsecs).
Animal Cells do not contain a (B Cell Wall) instead have a Plasma Membrane which is made up of I believe a lipid bi layer.<span />
The correct answer should be something like: "Gene therapy involves the use of bacteria or viruses to deliver new or modified genes to cells". That is what can be concluded based on the paragraph you provided.
The obvious answer is a bc it does not use and toxic fuels
