Answer:
b. G
Explanation:
In RNA transcription, uracil pairs with adenine instead of thymine.
Answer:
Whales = lungs
Clams = gills
Spiders = tracheal system
The shape of an enzymes active site fits the shape of a certain molecule that is affected by the enzyme. It's like a puzzle piece fitting into another puzzle piece. The molecule in the reaction being catalyzed fits into the enzyme. Hopefully this helps, this is how I was taught
<span>about 150 million kilometers
hope this helps</span>
