The lac repressor prevents the lac genes in the DNA of E. coli from being expressed most of the time. The answer to your question is A. I hope this is the answer that you are looking for and it comes to your help.
Answer:
B
Explanation:
Diamond is the highest on the hardness scale, while quartz is lower, only a diamond can scratch a diamond
It’s between d and c but d sounds better
<span>The name Mesopotamia comes from the Greek for 'middle' and 'river,' and meant'' between the two rivers ''</span>
Effect: Radiogenic heat released- Cause: convection currents cycle through magma.
2.) Effect: Earth has a powerful magnetic field- Cause: Iron in earths outer core swirls due to convection currents.
3.) Effect: tectonic plates move- Cause: unstable isotopes in earth release energy.
: ) I think this is right
