D. He controlled variables by studying one or two traits at a time
Answer:
Pros:
Can extend lives
Can create organs
Help eliminate weak genes
Cure disorders
Cons:
Limits sense of individuality
Potential for faster aging
Can be used for exploitation
Debatable ethically
Hope this helps :0)
Organs are made up of many tissues
<span>In order for the muscle fatigue to end the muscle cells must be provided with oxygen to 'burn' the lactic acid.
Hope this helps!
-Payshence xoxo</span>
